There’s something uniquely captivating about the Irish last names that reflect a rich history, from the powerful Ó Murchadha (Murphy) to the distinct Ó Mongáin (Mongan). These names aren’t just labels – they represent generations of resilience, heritage, and the deep connections to the Irish land and its people. Take, for example, Ó Mongáin, which speaks to strength and warrior traditions in Ireland’s northern regions, reflecting the Gaelic ideals of courage and leadership.

From surnames steeped in history to themed first-name lists, our Irish name database has it all—including a collection of names that start with M.

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Authentic Irish Last Names that Start with M

🌟 Our Favourite: Ó Murchadha (Murphy)

Pronunciation: oh-MUR-khuh
First recorded: 11th century
Meaning: Meaning “descendant of Murchadh,” with Murchadh translating to “sea warrior” or “warrior of the sea.”
Why it’s our favourite: Ó Murchadha (Murphy) is one of the most enduring and influential Irish last names, steeped in centuries of history. The name has been carried by warriors, landowners, and leaders who fought against invaders and shaped Ireland’s identity. It’s deeply rooted in Irish culture and carries the strength of its sea warrior heritage, which is why it’s our favourite. It continues to be a symbol of Irish pride and resilience, with global recognition and widespread use today.

🏹 MacAilín (MacAllen)

Pronunciation: muh-KAL-in
First recorded: 13th century
Region: Scotland, Ulster
Meaning: Derived from the personal name Ailín, a diminutive of Ailill, meaning “little rock” or “noble.” It originated in Scotland with the Clan MacAllan and became established in Ulster through Scottish migration. The name was associated with warriors and landholders, particularly in Antrim and Tyrone. Over time, the MacAilíns became known for their leadership roles in Gaelic society, often serving as chieftains or military commanders.

🍀 MacAonghuis (MacGuinness)

Pronunciation: muh-KAYN-iss
First recorded: 13th century
Region: Ulster
Meaning: Meaning “son of Aonghus,” which translates to “one strength” or “unique force.” The MacGuinness family were powerful lords in County Down, ruling the Iveagh region for centuries. They descended from the Uí Echach Cobo and were known for their resistance against Anglo-Norman expansion. The name remains common in Northern Ireland, and Brian Magennis was a notable Gaelic leader in the 16th century.

⚔️ MacBaith (MacBate)

Pronunciation: muh-BAYT
First recorded: 15th century
Region: Leinster
Meaning: Derived from the Old Gaelic Mac Báid, meaning “son of Báid” (a given name that may mean “boat” or relate to religious devotion). The MacBates were known as learned men, often serving as scribes and poets in medieval Ireland. The name was historically concentrated in Meath and Westmeath, though it diminished after the Tudor conquest.

🎭 MacBhradaigh (MacBrady)

Pronunciation: muh-BRAH-dee
First recorded: 1250
Region: Cavan, Meath
Meaning: Derived from bradach, meaning “spirited” or “thieving.” The MacBradys were a significant brehon (legal) family in Breifne, serving as hereditary judges and poets. They were allies of the O’Reillys and played a crucial role in Gaelic administration before the English took control. A notable bearer was Hugh Brady, the first Protestant Bishop of Meath in the 16th century.

🔥 MacBhloscaidh (MacCloskey)

Pronunciation: muh-KLOSS-kee
First recorded: 12th century
Region: Derry
Meaning: Likely derived from blosc, meaning “explosive” or “boisterous.” The MacCloskeys were a branch of the O’Cathain (O’Kane) family in Derry, acting as their hereditary marshals. They controlled territory near the River Bann and were known for their martial prowess. Their resilience against English encroachment helped preserve Gaelic customs in the region for longer than elsewhere.

🦁 MacCárthaigh (MacCarthy)

Pronunciation: muh-KAR-tee
First recorded: 1045
Region: Munster
Meaning: One of the most powerful Gaelic last names, meaning “son of Cárthach” (meaning “loving” or “friendly”). The MacCarthys ruled Desmond (southern Munster) for centuries, rivaling the O’Briens. They built strongholds such as Blarney Castle and remained influential even after the Cromwellian conquest. A famous bearer is Charles MacCarthy, a 17th-century Irish officer in France.

🛡️ MacCathmhaoil (MacCamphill)

Pronunciation: muh-KATH-wool
First recorded: 14th century
Region: Ulster, Scotland
Meaning: Derived from cathmhaol, meaning “battle chief” or “warrior servant.” The MacCathmhaols were prominent in Tyrone and Antrim, often serving as military leaders for the O’Neills. The name also appears in Scotland, where it was anglicized as Campbell in some cases.

🌊 MacCearáin (MacKearan)

Pronunciation: muh-KER-awn
First recorded: 15th century
Region: Connacht
Meaning: Likely derived from cear, meaning “dusky” or “dark.” The MacCearáin family were coastal dwellers in Galway and Mayo, often linked to seafaring and fishing. They were known for their resilience during Viking raids and later as shipwrights for local lords.

⚡ MacCionnaith (MacKenna)

Pronunciation: muh-KYUN-uh
First recorded: 11th century
Region: Monaghan
Meaning: Comes from cionn, meaning “leader” or “head.” The MacKennas were rulers of Truagh in Monaghan, often at war with neighboring clans. They resisted English rule into the 17th century and were famed for their strategic abilities. The name is still widespread in Ulster, with the modern Kenna last name derived from it.

🏰 MacCoghláin (MacCoughlan)

Pronunciation: muh-KOH-lan
First recorded: 11th century
Region: Offaly
Meaning: Meaning “son of Cochláin,” a diminutive of cochal (“hood” or “cloak”), possibly referring to monks. The MacCoghláns were lords of Delvin in Offaly, controlling the territory until the 17th century. They built the now-ruined Leap Castle, said to be haunted due to clan conflicts.

🌊 MacConmara (MacNamara)

Pronunciation: muh-KON-muh-rah
First recorded: 1138
Region: Clare
Meaning: Meaning “son of Cumara,” derived from cu mara, meaning “sea hound” or “warrior of the sea.” The MacNamaras were chiefs of Clann Cuilein in Thomond and served as hereditary marshals to the O’Briens. They built numerous castles, including Knappogue Castle, and played key roles in Irish resistance against the Normans and later the English.

🔥 MacConboirne (MacConborne)

Pronunciation: muh-KON-burn
First recorded: 15th century
Region: Connacht
Meaning: Derived from con (hound) and boirne (rocky land), likely meaning “hound of the rocky terrain.” This family was known in western Ireland, particularly around the Burren, an area of distinctive limestone landscapes. They were primarily warriors and landholders, fiercely independent and resistant to outside rule.

🏹 MacConmhaoil (MacConville)

Pronunciation: muh-KON-vil
First recorded: 12th century
Region: Ulster
Meaning: Meaning “son of Conmhaol,” derived from con (hound) and mhaol (bald or tonsured), possibly indicating a connection to a monastic order. The MacConville family were known as followers of the O’Neills and later became prominent landowners in Down and Armagh. They were skilled horsemen and were involved in conflicts against both Gaelic and Norman rivals.

🍀 MacCumaill (MacCool)

Pronunciation: muh-KOO-mill
First recorded: 3rd century
Region: Leinster
Meaning: Best known from the legendary warrior Fionn MacCumhaill, this last name means “son of Cumhall,” with Cumhall possibly meaning “champion.” Though largely a mythical figure, Fionn MacCumhaill was associated with the Fianna, an elite band of warriors in early Irish folklore. The name itself survived in pockets of Leinster and Ulster but became rare over time.

⚔️ MacDaibhéid (MacDavitt)

Pronunciation: muh-DAV-it
First recorded: 16th century
Region: Donegal
Meaning: Derived from the given name Daibhéid (David), meaning “son of David.” The MacDavitts were closely associated with the O’Donnells and fought in the Nine Years’ War against English rule. Many later settled in Scotland and America, particularly during the Plantation of Ulster. A notable bearer was Phelim MacDavitt, an Irish rebel leader.

🌳 MacDara (MacDaragh)

Pronunciation: muh-DAR-ah
First recorded: 14th century
Region: Galway
Meaning: Meaning “son of Dara,” from dair (oak tree), symbolizing strength and endurance. The MacDara name is closely tied to Saint MacDara, the patron saint of seafarers in Connemara. A famous church, Teampall MacDara, was built in his honor. The name was prominent among coastal clans and remains popular in Galway today.

🦅 MacDónaill (MacDonnell)

Pronunciation: muh-DON-ill
First recorded: 1250
Region: Antrim, Scotland
Meaning: Derived from Domhnall (world ruler), meaning “son of Domhnall.” The MacDonnells were a branch of the Scottish Clan Donald and settled in Antrim as powerful lords. They played a major role in Irish-Scottish relations and controlled large territories in Ulster. Sorley Boy MacDonnell was one of the most famous Gaelic leaders in the 16th century.

🛡️ MacDonnchadha (MacDonagh)

Pronunciation: muh-DUN-uh-ha
First recorded: 10th century
Region: Connacht
Meaning: Meaning “son of Donnchadh,” which comes from donn (brown-haired) and cath (battle). The MacDonaghs were rulers of Tireragh in Sligo and were vassals to the O’Connors. They were known as fierce warriors and resisted English rule into the 17th century. Michael MacDonagh was a notable historian and writer in the 19th century.

🌊 MacDubháin (MacDuane)

Pronunciation: muh-DOO-awn
First recorded: 14th century
Region: Mayo
Meaning: Meaning “son of Dubhán,” from dubh (black, dark). Dubhán was a common personal name, often associated with monks and religious figures. The MacDubháin family were landowners and fishermen along the western coast, known for their maritime skills. The name is closely linked to Saint Dubhán, an early Irish missionary.

⚓ MacDubhghaill (MacDowell)

Pronunciation: muh-DOOL
First recorded: 12th century
Region: Antrim, Scotland
Meaning: Meaning “son of Dubhghall,” where dubhghall means “dark foreigner,” a term originally used to distinguish Danes from Norwegians during Viking invasions. The MacDowells were originally of Norse-Gaelic descent and were closely linked to the Lords of the Isles in Scotland. They became influential in Antrim, particularly during the medieval period.

🏇 MacEachmharcach (MacEachern)

Pronunciation: muh-KAHK-ar-kah
First recorded: 13th century
Region: Scotland, Ulster
Meaning: Derived from Eachmharcach, meaning “horse rider” or “knight.” The MacEacherns were originally from the Scottish Highlands and served as hereditary squires to the Lords of the Isles. When the MacDonalds expanded their influence into Antrim, the MacEacherns followed, becoming key figures in the region’s Gaelic aristocracy. They were skilled cavalrymen and known for their loyalty in clan warfare.

⚡ MacFhionnlaoich (MacKinley)

Pronunciation: muh-FIN-lee
First recorded: 14th century
Region: Ulster, Scotland
Meaning: Meaning “son of Fionnlaoch,” derived from fionn (fair, bright) and laoch (warrior, hero). The MacKinleys were prominent in Scotland and Ireland, serving as warriors and advisors to Gaelic kings. They were particularly associated with the Western Isles and later settled in Ulster. In modern history, William McKinley, 25th President of the United States, carried a version of the name.

🛠️ MacGabhann (MacGowan)

Pronunciation: muh-GOW-an
First recorded: 11th century
Region: Cavan, Westmeath
Meaning: Derived from gabhann, meaning “blacksmith.” The MacGowans were renowned metalworkers in medieval Ireland, supplying weapons and tools to Gaelic chieftains. They were particularly important in Breifne, where they worked for the O’Reillys and O’Rourkes. The name remains common in Cavan and Longford, reflecting their deep roots in the area.

🏔️ MacGiollaChuda (MacGillacuddy)

Pronunciation: muh-GILL-ah-KOO-dee
First recorded: 12th century
Region: Kerry
Meaning: Meaning “son of the devotee of St. Mochuda.” The MacGillacuddys were a branch of the O’Sullivans and controlled lands near the MacGillycuddy’s Reeks, Ireland’s highest mountain range. They were known as fierce warriors, resisting English encroachment well into the 17th century. The rugged landscape they inhabited helped shape their reputation as a resilient and independent people.

🎻 MacGiollaEáin (MacGillane)

Pronunciation: muh-GILL-awn
First recorded: 15th century
Region: Clare, Limerick
Meaning: Meaning “son of the devotee of John.” This last name likely originated among families with religious affiliations, particularly those serving as custodians of churches dedicated to St. John. The MacGillanes were poets and musicians in medieval Munster, known for their contributions to Gaelic literature and song.

📜 MacGiollaMhartain (MacGillmartin)

Pronunciation: muh-GILL-mar-tin
First recorded: 14th century
Region: Tyrone, Donegal
Meaning: Meaning “son of the devotee of St. Martin.” The MacGillmartins were scribes and scholars in Gaelic Ireland, often attached to monasteries and bardic schools. They were closely allied with the O’Neills and O’Donnells, serving as chroniclers of important historical events. The name remains common in Ulster today.

🦅 MacGiollaRiabhaigh (MacGillreavy)

Pronunciation: muh-GILL-REE-vee
First recorded: 16th century
Region: Galway, Mayo
Meaning: Meaning “son of the devotee of Riabhach,” where riabhach means “grey” or “striped.” This could refer to a patron saint or an ancestor known for his distinct hair color. The MacGillreavys were a seafaring clan along the west coast, involved in fishing and trade. They had strong ties to the O’Flahertys, who ruled much of Connemara.

🌊 MacGiollaUíbh (MacGilvey)

Pronunciation: muh-GILL-vee
First recorded: 17th century
Region: Leitrim, Roscommon
Meaning: Meaning “son of the devotee of Uíbh,” possibly a reference to a specific saint or regional leader. The MacGilveys were landholders and cattle farmers, often acting as stewards for larger Gaelic families. The name declined in use following the Cromwellian conquest but persists in parts of Connacht.

🏡 MacLabhartaigh (MacLaverty)

Pronunciation: muh-LAV-ar-tee
First recorded: 14th century
Region: Donegal, Scotland
Meaning: Derived from labhraidh, meaning “speaker” or “spokesperson.” The MacLavertys were known as heralds and diplomats in medieval Gaelic society, often serving as emissaries between warring factions. Some settled in Scotland during the 16th and 17th centuries, integrating with Highland clans. Today, the name is most commonly found in Ulster.

🌾 MacLuighdeach (MacLoudagh)

Pronunciation: muh-LOO-dah
First recorded: 15th century
Region: Clare, Limerick
Meaning: Derived from luigheach, meaning “healer” or “physician.” The MacLoudaghs were known as medical practitioners in Munster, providing services to Gaelic lords. They were part of a long tradition of hereditary physicians in Ireland, passing down knowledge of herbal remedies and treatments. Some later became involved in the Catholic priesthood.

🌊 MacLughaidh (MacLough)

Pronunciation: muh-LOO-ee
First recorded: 14th century
Region: Galway, Clare
Meaning: Derived from Lughaidh, a personal name linked to the ancient god Lugh, associated with light, skill, and kingship. The MacLughaidh family were historically linked to the O’Flahertys in Connacht and were known as seafarers and landholders along the western coastline. Some later became renowned poets and scholars, preserving Gaelic traditions during the decline of native rule.

🏹 MacMurchaidh (MacMurphy)

Pronunciation: muh-MUR-fee
First recorded: 11th century
Region: Wexford, Cork
Meaning: Meaning “son of Murchadh,” from muir (sea) and cath (battle), signifying a sea warrior. The MacMurphys were closely connected to the Uí Ceinnselaigh dynasty in Leinster and were fierce opponents of the Anglo-Normans. They later spread to Munster, where they became known for their resistance against English rule, particularly in the 17th century.

🏰 MacMhuircheartaigh (MacMoriarty)

Pronunciation: muh-WEER-kur-tee
First recorded: 1100
Region: Kerry
Meaning: Meaning “son of Muircheartach,” which comes from muir (sea) and ceartach (ruler). The MacMoriartys were the ancient lords of Loch Lein in Kerry and were once powerful allies of the O’Donoghues and O’Sullivans. They played a key role in Munster’s resistance against Norman expansion. Today, the name is still strongly associated with Kerry, particularly around Killarney.

🔥 MacPhaidín (MacFadden)

Pronunciation: muh-FAH-deen
First recorded: 16th century
Region: Donegal
Meaning: Derived from Páidín, a diminutive of Pádraig (Patrick), meaning “son of little Patrick.” This name became common in Donegal and was often associated with religious devotion. Many MacFaddens served as clerics and educators, while others were involved in the fishing industry along the rugged northern coast.

⚔️ MacRuairí (MacRory)

Pronunciation: muh-ROO-ree
First recorded: 12th century
Region: Ulster, Scotland
Meaning: Meaning “son of Ruairí,” from the Norse Hrothrekr, meaning “famous ruler.” The MacRuairís were originally part of the ruling Gaelic-Norse clans in the Western Isles of Scotland and later became prominent in Ulster. They were known as skilled warriors and seafarers, often engaging in battles against both Scottish and English forces.

🦅 MacSeáin (MacShane)

Pronunciation: muh-SHAWN
First recorded: 14th century
Region: Tyrone
Meaning: Meaning “son of Seán” (John). The MacShanes were a branch of the O’Neills and were directly descended from Shane O’Neill, the powerful 16th-century chieftain who defied English rule. The name was often associated with nobility and leadership, and many MacShanes played significant roles in Irish rebellions.

📜 MacSraith (MacStravick)

Pronunciation: muh-SRAY-ick
First recorded: 15th century
Region: Armagh, Louth
Meaning: Likely derived from sraith, meaning “meadow” or “stream.” The MacSraith family were known as hereditary poets and scribes in medieval Ulster, often attached to the Gaelic courts of the O’Neills and the Maguires. Their name is rare today, but remnants of their influence remain in historical Irish literature.

🛡️ MacSuibhne (MacSweeney)

Pronunciation: muh-SWEEN-ee
First recorded: 14th century
Region: Donegal, Cork
Meaning: Meaning “son of Suibhne,” from suibhne (pleasant or well-disposed). The MacSweeneys were originally of Scottish descent but became famous as professional mercenaries (gallowglasses) in Ireland. They served as elite warriors for Gaelic lords, particularly in Donegal, and established a stronghold in Munster as well. Their legacy is deeply tied to Ireland’s military history.

Last Names with a Strong Irish Influence

📜 Mac an Bhaird (McWard)

Pronunciation: muhk-ahn-WARD
First recorded: 12th century
Region: Donegal, Galway
Meaning: Meaning “son of the bard,” this name was associated with hereditary poets and historians in Gaelic society. The Mac an Bhaird family were highly regarded as court bards for the O’Donnells in Donegal and the O’Connors in Connacht. They composed elaborate praise poetry and historical chronicles, preserving Ireland’s rich oral traditions. Many later became teachers and writers during the cultural revival.

🛠️ Mac an Ghabhann (McGowan)

Pronunciation: muhk-ahn-GOW-an
First recorded: 11th century
Region: Cavan, Longford
Meaning: Derived from gabhann, meaning “blacksmith,” this last name reflects a long-standing tradition of metalwork. The Mac an Ghabhann families were skilled smiths, producing weapons and tools for Gaelic clans. They were particularly influential in Breifne, where they supplied arms for the O’Reillys and O’Rourkes. The name remains common in parts of Ulster and Connacht.

🏹 Mac an tSaoi (McAteer)

Pronunciation: muhk-ahn-TSEE
First recorded: 14th century
Region: Armagh
Meaning: Meaning “son of the scholar” or “son of the wise one,” the Mac an tSaoi family were known for their roles as learned men, advisors, and educators. Many served as tutors to Gaelic chieftains or held positions in religious communities. Their legacy continues in the field of literature, with figures like poet Gearóid Mac an tSaoi carrying the name.

⚔️ Mac Aoidh (McHugh)

Pronunciation: muhk-EE
First recorded: 12th century
Region: Donegal, Mayo
Meaning: Meaning “son of Aodh,” from Aodh, meaning “fire” or “fiery warrior.” The McHughs were powerful in Donegal, acting as chiefs under the O’Donnells. Some branches moved west to Mayo, where they played a role in resisting English expansion. The name is associated with strong leadership, and its bearers often held positions of military or political importance.

⚖️ Mac an Bhreithiún (McBrehon)

Pronunciation: muhk-ahn-VREH-yoon
First recorded: 13th century
Region: Clare, Mayo
Meaning: Meaning “son of the judge,” this last name was associated with hereditary Brehon law judges. The Mac an Bhreithiún families were responsible for legal arbitration under Ireland’s ancient legal system, which lasted until the 17th century. They had a reputation for wisdom and fairness, often mediating disputes between clans and rulers.

🏰 Mac Artáin (McCartan)

Pronunciation: muhk-AR-tawn
First recorded: 12th century
Region: Down
Meaning: Meaning “son of Artán,” a diminutive of Art, meaning “bear” or “champion.” The McCartans were a warrior clan in Ulster, originally vassals to the O’Neills before establishing their own territory in County Down. They were known for their fierce resistance against Anglo-Norman incursions and later supported the Jacobite cause in the 17th century.

✝️ Mac Giolla Bhríghde (McBride)

Pronunciation: muhk-GILL-ah-BREE-da
First recorded: 14th century
Region: Donegal, Antrim
Meaning: Meaning “son of the devotee of St. Brigid,” this name reflects a strong religious tradition. The Mac Giolla Bhríghde family were custodians of churches and religious sites dedicated to St. Brigid, one of Ireland’s most venerated saints. They played an active role in Irish monastic life, with some members later becoming priests and bishops.

🏔️ Mac Giolla Chomhaill (McElhill)

Pronunciation: muhk-GILL-ah-HULL
First recorded: 15th century
Region: Tyrone
Meaning: Meaning “son of the devotee of St. Comhghall,” referring to a connection with St. Comgall, founder of Bangor Abbey. The McElhills were a learned family in Ulster, often serving as scribes and historians. They were also known as guardians of local monastic schools, ensuring the survival of Irish language and tradition.

🌊 Mac Giolla Domhnaigh (McEldowney)

Pronunciation: muhk-GILL-ah-DOH-nee
First recorded: 16th century
Region: Derry
Meaning: Meaning “son of the devotee of Sunday,” this last name suggests a deep religious association, possibly connected to clerical families or those involved in monastic life. The McEldowneys were known for their involvement in local governance and legal affairs in the north of Ireland. Some later emigrated to Scotland and the United States.

🎻 Mac Giolla Eáin (McElhenny)

Pronunciation: muhk-GILL-ah-AWN
First recorded: 17th century
Region: Donegal
Meaning: Meaning “son of the devotee of St. John,” this name reflects a long-standing connection to religious service. The McElhenny family were associated with church landholdings and were known as musicians and poets in Donegal. Their role in preserving traditional Irish music and folklore is well-documented in local history.

🎭 Mac Giolla Eoin (McLoon)

Pronunciation: muhk-GILL-ah-OWN
First recorded: 15th century
Region: Connacht
Meaning: Meaning “son of the devotee of John,” this last name reflects a strong religious tradition, likely linked to monastic life. The Mac Giolla Eoins were known as scribes and clerics, maintaining historical records in Connacht. Over time, the name became more common among landowners and traders. The anglicized version, McLoon, is rarer but persists in parts of western Ireland.

🌊 Mac Giolla Iasachta (McLoughlin)

Pronunciation: muhk-GILL-ah-EE-shak-ta
First recorded: 12th century
Region: Ulster, Connacht
Meaning: Meaning “son of the devotee of the foreigner,” this name likely referred to a connection with Viking or Norman settlers. The Mac Giolla Iasachta family were prominent in Ulster, particularly around Donegal, and later spread into Connacht. They were known as navigators and traders, blending Gaelic and Norse influences in their culture.

✝️ Mac Giolla Phádraig (MacGilpatrick)

Pronunciation: muhk-GILL-ah-PAW-drig
First recorded: 11th century
Region: Kilkenny, Laois
Meaning: Meaning “son of the devotee of St. Patrick,” this last name was associated with a powerful Gaelic dynasty. The Mac Giolla Phádraigs were rulers of Osraige (modern Kilkenny and Laois) and played a key role in resisting Norman conquest. They later adopted the anglicized name Fitzpatrick but retained their strong Gaelic identity.

🦅 Mac Giolla Riabhaigh (McGillreavy)

Pronunciation: muhk-GILL-ah-REE-vee
First recorded: 14th century
Region: Galway, Mayo
Meaning: Meaning “son of the devotee of Riabhach,” with riabhach meaning “grey” or “striped.” This last name suggests a connection to a saint or an ancestor with distinctive features. The Mac Giolla Riabhaigh family were primarily found in the west of Ireland, often involved in maritime trade and fishing.

🏹 Mac Ionnrachtaigh (McEnroe)

Pronunciation: muhk-IN-ruck-tee
First recorded: 13th century
Region: Cavan, Longford
Meaning: Derived from ionnrachtach, meaning “lawful” or “legitimate,” this last name indicated a family with legal or noble status. The Mac Ionnrachtaighs were a branch of the O’Reillys in Breifne and played key roles as land stewards and judges. A modern bearer, tennis star John McEnroe, has brought international recognition to the name.

🔥 Mac Maoláin (McMullan)

Pronunciation: muhk-MOO-lawn
First recorded: 14th century
Region: Antrim, Derry
Meaning: Meaning “son of the tonsured one,” this last name likely indicated a family with ties to religious service. The Mac Maoláin family were closely linked to the O’Neills of Ulster and often acted as advisors or scribes. Over time, they became landowners and warriors, maintaining influence in Antrim and Derry.

📜 Mac MaolEoin (McMallon)

Pronunciation: muhk-MOOL-own
First recorded: 15th century
Region: Tyrone
Meaning: Meaning “son of the tonsured John,” this last name combines religious devotion with a strong Gaelic tradition. The Mac MaolEoins were associated with monastic communities in Tyrone and later became involved in Gaelic legal systems. Their influence declined after the Plantation of Ulster, but the name persists in the north.

🏰 Mac Piarais (McPiers)

Pronunciation: muhk-PEER-ish
First recorded: 16th century
Region: Dublin, Wexford
Meaning: Meaning “son of Piers,” this last name originated from Norman influence in Ireland. The Mac Piarais family were often involved in military and political affairs, serving as knights and landowners. The name is historically linked to figures such as Patrick Pearse, a leader of the 1916 Easter Rising, who symbolized Irish independence.

⚔️ Mac Tighearnáin (McKiernan)

Pronunciation: muhk-KEER-nan
First recorded: 11th century
Region: Cavan, Leitrim
Meaning: Meaning “son of Tighearnán,” from tighearna, meaning “lord” or “ruler.” The Mac Tighearnáin family were a dominant Gaelic clan in Breifne, ruling over lands in Cavan. They were known as fierce warriors and resisted English rule for centuries. Today, the name is still strongly associated with the region.

🍀 Mag Aonghusa (Magennis)

Pronunciation: mag-AYN-gus-ah
First recorded: 12th century
Region: Down
Meaning: Meaning “son of Aonghus,” this last name was carried by a powerful Ulster clan. The Magennises ruled over parts of County Down and were known for their strategic castles, including Rathfriland. They played a significant role in defending Gaelic Ulster before their lands were confiscated during the Plantation.

🏰 Mag Amhlaoibh (MacAuliffe)

Pronunciation: mag-OW-liff
First recorded: 13th century
Region: Cork, Limerick
Meaning: Meaning “son of Amhlaoibh,” an Irish form of the Norse name Olaf, this last name reflects the strong Viking influence in medieval Ireland. The MacAuliffes were prominent in north Cork, where they held lands and built defensive structures. They were closely allied with the O’Keeffes and resisted Norman incursions. The family maintained a Gaelic identity despite increasing English control.

⚔️ Mag Mathúna (MacMahon)

Pronunciation: mag-mah-HOON-ah
First recorded: 12th century
Region: Clare, Monaghan
Meaning: Meaning “son of Mathghamhain,” from mathghamhain (bear), symbolizing strength. The MacMahons of Thomond were renowned warriors and allies of the O’Briens, while the MacMahons of Ulster ruled over Monaghan. They played significant roles in Gaelic resistance against English forces, particularly during the Nine Years’ War.

🛡️ Mag Uidhir (Maguire)

Pronunciation: mag-WEER
First recorded: 10th century
Region: Fermanagh
Meaning: Meaning “son of Odhar,” from odhar (pale or dun-colored), possibly referencing a notable ancestor’s appearance. The Maguires were the ruling dynasty of Fermanagh and maintained control of the region for centuries. They were known for their warrior kings and their role in Irish politics, especially during the Tudor conquest.

🌊 MaolÁin (Mullan)

Pronunciation: mool-AWN
First recorded: 14th century
Region: Tyrone, Derry
Meaning: Meaning “descendant of the tonsured one,” this last name suggests an early connection to monastic life. The Mullan family were custodians of religious sites and later became landowners in Ulster. The name is still widely found in the north, with many bearing it in its anglicized forms today.

🎼 MaolChiaráin (Mulkerin)

Pronunciation: mool-KEER-awn
First recorded: 15th century
Region: Galway, Mayo
Meaning: Meaning “descendant of Ciarán,” from ciar (dark-haired). The MaolChiaráin family were linked to St. Ciarán, one of Ireland’s most revered early saints. They were musicians and poets in medieval Connacht, often serving as hereditary bards for local lords.

📜 MaolChonaire (Mulconry)

Pronunciation: mool-KON-ree
First recorded: 12th century
Region: Roscommon, Galway
Meaning: Meaning “descendant of Conaire,” this last name was borne by a famous family of historians and scribes. The MaolChonaires served as official chroniclers for Gaelic kings and produced many important manuscripts. Their work was crucial in preserving Irish history, particularly during the decline of native rule.

🔥 MaolMórdha (Mulmurry)

Pronunciation: mool-MOR-ah
First recorded: 11th century
Region: Leinster
Meaning: Meaning “descendant of Mórdha,” from mórdha (majestic, noble). This last name was associated with Leinster warriors who opposed Norman expansion. They were involved in the defense of Gaelic lands during the medieval period and later adapted to changing political landscapes by serving as landlords under English rule.

⚖️ MaolSeachlainn (Mulshannagh)

Pronunciation: mool-SHAKH-linn
First recorded: 10th century
Region: Meath, Westmeath
Meaning: Meaning “descendant of Seachlainn,” referring to an ancestor linked to the famous High King Máel Sechnaill. The MaolSeachlainns were landholders in the Midlands and remained influential into the Norman period. Their legacy is intertwined with the ruling dynasties of early medieval Ireland.

🍀 Ó Maonaigh (Mooney)

Pronunciation: oh-MOON-ee
First recorded: 10th century
Region: Offaly, Laois
Meaning: Meaning “descendant of Maonach,” from maonach (wealthy or noble). The Ó Maonaigh family were originally chieftains in the Midlands and later became well-known scholars and religious figures. The name remains popular today, both in Ireland and among the Irish diaspora.

🏹 Ó Maolmhiadhacháin (Mulvaugh)

Pronunciation: oh-MOOL-VEE-uh-hawn
First recorded: 14th century
Region: Galway, Clare
Meaning: Meaning “descendant of the devotee of Miadhachán,” referring to an ancestor named after a lesser-known Irish saint. The Ó Maolmhiadhacháin family were closely connected to monastic life and held roles as custodians of church lands. The name is rare today but remains a part of Ireland’s historical record.

🍇 Ó Maoilbhearaigh (Mulberry)

Pronunciation: oh-MOOL-VAR-ee
First recorded: 14th century
Region: Leinster
Meaning: Meaning “descendant of the devotee of Bhearaigh,” possibly referring to an unknown saint or place. The last name may have originated from monastic families, as the maol prefix suggests a connection to religious orders. Over time, the name became associated with landowners and merchants in Leinster. It is rare today but has historical ties to both Gaelic and Anglo-Irish families.

✝️ Ó Maoilmhichíl (Mulvihill)

Pronunciation: oh-MOOL-VIK-il
First recorded: 11th century
Region: Roscommon, Longford
Meaning: Meaning “descendant of the devotee of St. Michael,” this last name was closely linked to early Irish religious communities. The Ó Maoilmhichíls were hereditary keepers of church lands and scribes in medieval Connacht. They later became warriors, serving as allies of the O’Connors in battles against Norman forces. The name remains common in the midlands.

🏹 Ó Maoilriain (Mulryan)

Pronunciation: oh-MOOL-REE-an
First recorded: 13th century
Region: Limerick, Tipperary
Meaning: Meaning “descendant of the devotee of Rian,” possibly referring to a noble or warrior ancestor. The Ó Maoilriains were once powerful lords of Owney in Limerick, serving under the O’Briens of Thomond. They were known for their military strength and were deeply involved in Gaelic resistance against English rule.

⚔️ Ó Maoilsheachlainn (Mulshannagh)

Pronunciation: oh-MOOL-SHAKH-linn
First recorded: 10th century
Region: Meath, Westmeath
Meaning: Meaning “descendant of the devotee of Seachlainn,” referring to an ancestor associated with the famous High King Máel Sechnaill. The family was originally linked to the ruling Uí Néill dynasty and held significant power in central Ireland before losing influence after the Norman invasions.

🌊 Ó Móráin (Moran)

Pronunciation: oh-MOR-awn
First recorded: 11th century
Region: Mayo, Galway
Meaning: Derived from mór, meaning “great” or “big.” The Ó Móráin family were landholders in Connacht and served as chieftains and judges. They were deeply involved in the preservation of Gaelic law and traditions. The name remains one of the most common last names in western Ireland and among the Irish diaspora.

🦅 Ó Muireagáin (Morrigan)

Pronunciation: oh-MURR-uh-gawn
First recorded: 12th century
Region: Meath, Louth
Meaning: Possibly linked to the Morrígan, the mythological goddess of battle and sovereignty. The Ó Muireagáins were known as warriors and advisors to Gaelic kings. They played an important role in conflicts against the Normans and later in Irish rebellions. The last name carries strong legendary associations with strength and prophecy.

🏰 Ó Muircheartaigh (Moriarty)

Pronunciation: oh-MURK-er-tee
First recorded: 1100
Region: Kerry
Meaning: Meaning “descendant of Muircheartach,” from muir (sea) and ceartach (ruler). The Ó Muircheartaighs were once the rulers of Loch Lein in Kerry and maintained strong alliances with the O’Sullivans. They resisted Norman expansion and were a key Gaelic power in Munster until the Cromwellian era.

🏴‍☠️ Ó Muirgheasa (Murray)

Pronunciation: oh-MUR-gesh-ah
First recorded: 12th century
Region: Donegal, Sligo
Meaning: Meaning “descendant of Muirgheas,” from muir (sea) and geas (taboo, magical protection). This last name suggests a family linked to seafaring or spiritual traditions. The Ó Muirgheasas were known as shipwrights and warriors in Ulster, often engaging in raids and maritime trade.

🛡️ Ó Muirí (Murray)

Pronunciation: oh-MOOR-ee
First recorded: 13th century
Region: Galway, Westmeath
Meaning: Meaning “descendant of Muirí,” derived from muir (sea). The Ó Muirís were landowners and warriors, often serving under Gaelic kings in battle. The name remains common in both Ireland and Scotland, where it was adopted by Gaelic-speaking clans.

📜 Ó Muirneacháin (Murnaghan)

Pronunciation: oh-MUR-nah-hawn
First recorded: 14th century
Region: Monaghan, Tyrone
Meaning: Meaning “descendant of Muirneachán,” from muirneach (beloved or affectionate). The Ó Muirneacháin family were known as poets and historians in Ulster, often serving as chroniclers for the O’Neills and other ruling families. Many later became legal scholars or clergymen.

🌊 Ó Mongáin (Mongan)

Pronunciation: oh-MON-gawn
First recorded: 12th century
Region: Donegal, Tyrone
Meaning: The last name Ó Mongáin derives from Mongán, which is a diminutive of Mongach, meaning “one who is strong” or “warrior.” This family was prominent in the northern part of Ireland, particularly in Donegal, where they were noted for their resistance against the English during the 16th century. They were closely associated with the O’Donnells and other Gaelic lords, often acting as warriors or leaders. The name is uncommon today, but it has historical importance in the context of Irish chieftains.

🛡️ Ó Muiridhe (Murdy)

Pronunciation: oh-MOOR-ee
First recorded: 13th century
Region: Louth, Monaghan
Meaning: Meaning “descendant of Muiridhe,” which refers to an ancestor named Muiridhe, meaning “lord” or “chieftain.” The Ó Muiridhes were landowners and warriors in Leinster and Ulster. They often fought alongside other prominent Gaelic families, such as the O’Neills and O’Connors, against English settlers. The last name is still present today, though anglicized as Murdy in some regions.

🏰 Ó Murcháin (Morahan)

Pronunciation: oh-MUR-khan
First recorded: 12th century
Region: Leinster
Meaning: The last name Ó Murcháin means “descendant of Murchán,” with Murchán derived from Murchadh, meaning “sea warrior.” This family was originally based in Leinster and was involved in the defense of Irish lands against Norman invaders. While the name eventually became more localized in certain areas, such as Kilkenny and Carlow, it has been carried through Irish history by notable figures in the military and legal professions.

If you’re interested in discovering more about your heritage or learning the stories behind other Irish names, explore more about Irish last names and their meanings.