This list covers 37 Irish first names that start with J, but here’s the honest headline: J isn’t one of the 18 letters of the traditional Irish alphabet, so almost every J name used in Ireland is an English or borrowed name, paired below with its genuine Irish form (Seán for John, Séamus for James, Siobhán for Joan) wherever one really exists.
We love the unique sound of Irish names but there aren’t many resources online to find lists for certain letters. Here you can find some great ideas for Irish first names to help get your creative juices flowing.
We have lists of Irish names for all people and purposes. Have a browse and find a new favourite! We also have a list of Irish last names that start with E that you might be interested in.
Quick answer: the J names with the strongest Irish ties
- Joan (Siobhán): “God is gracious,” brought by the Normans
- Jane (Sinéad): “God is gracious,” from French Jeannette
- Julia (Iúile, traditionally Síle): from the Roman name Julius; the most used J girls’ name in Ireland in 2025
- Jarlath (Iarlaith): after Tuam’s sixth-century patron saint
- James (Séamus): “supplanter,” the Hebrew Jacob; No. 4 for boys in 2025
- Jack (Seán): a pet form of John; No. 2 for boys in 2025
Irish Girls First Names that Start with J
Lots of Irish names for girls that start with the letter J are very different in Irish compared to English. For example, Seosaimhín is Josephine, and Siobhán is Joan. Plenty of the J names you’ll hear in Ireland today have no Irish form at all, and we’ve said so where that’s the case rather than inventing one.
⭐ Our Favourite: Seod (Jewel)
Pronunciation: Shode
First Used: Not a traditional given name, though the plural Seoda (“jewels”) has been given to a handful of Irish girls in recent years (five in 2025, according to the CSO)
Meaning: Seod means “jewel” in Irish, symbolizing something rare and precious. It’s also a real term of endearment: Ó Dónaill’s Irish dictionary gives “is í an tseoid í” for “she is a jewel, a darling.”
Why It’s Our Favourite: Seod is a genuine Irish word rather than a made-up “translation,” which is rarer than you’d think for a J name. A hidden gem of a name, quite literally!
🍀 Jane (Sinéad)
Pronunciation: Shin-ade
Meaning: An Irish form of Jane, Sinéad means “God is gracious.” It comes from Jeannette, a French pet form of Jeanne, and Woulfe also lists it for Janet and Jenny. Famous bearers include singer Sinéad O’Connor, known for her powerful voice and activism.
🌊 Jennifer
Pronunciation: Jen-if-er (Fionnghuala: Fin-oo-lah)
Meaning: There’s no traditional Irish form of Jennifer. It’s a Cornish form of the Welsh Gwenhwyfar (Guinevere), and it only became common outside Cornwall in the 20th century. You’ll often see Fionnghuala given as the “Irish for Jennifer,” but it’s a separate name. Fionnghuala means “fair-shouldered” and originates from ancient Irish mythology. It was borne by Fionnuala, one of the Children of Lir, transformed into a swan.
🏹 Jessica
Pronunciation: Jess-ih-ka
Meaning: There’s no Irish form of Jessica (“Seasica” isn’t a real name, and seas simply means “stand”). Jessica itself originated from Shakespeare’s The Merchant of Venice, and it’s still well used in Ireland, with 32 baby girls given the name in 2025.
🌺 Julia (Iúile, Síle)
Pronunciation: Oo-leh (Síle: Shee-leh)
Meaning: Derived from the Roman family name Julius, possibly from the Greek for “downy-bearded” (in other words, youthful). Iúile is the modern Irish form of Julia and shares roots with Iúil, the Irish word for July (and for Julius). In older Ireland, though, Julia was mostly used as the English stand-in for Síle, the Irish form of Cecilia, which Woulfe called “wrongly anglicised Julia.” Julia was the most popular J name for Irish baby girls in 2025, with 39 births.
🌸 Jasmine
Pronunciation: Jaz-min
Meaning: A delicate floral name, derived from the Persian word yasamin. There’s no Irish form of the name: the Irish word for the flower is seasmain, but it isn’t used as a given name. Jasmine is popular here all the same, with 23 Irish baby girls named Jasmine in 2025.
🌟 Josephine (Seosaimhín)
Pronunciation: Show-sa-veen
Meaning: A diminutive of Seosamh (Joseph), Seosaimhín means “God will increase.” Woulfe, writing in 1923, described it as a fairly recent name borrowed from the French.
🔥 Joan (Siobhán)
Pronunciation: Shiv-awn
Meaning: The Irish form of Joan, Siobhán means “God is gracious.” It was introduced to Ireland by the Normans and remains a strong traditional name. Siobhán McKenna, an acclaimed Irish actress, carried the name with grace.
😊 Joy (Áthas)
Pronunciation: Aw-hus
Meaning: Áthas is the Irish word for “joy” or “happiness.” It isn’t used as a given name in Ireland, so if you love Joy, the English name is the one to go with.
🌿 Janet (Sinéad)
Pronunciation: Shin-ade
Meaning: Like Jane, Janet has its Irish counterpart in Sinéad, meaning “God is gracious.” Though Janet was more common in Scotland, Sinéad remained a distinctively Irish choice.
💎 Jade
Pronunciation: Jayd
Meaning: Jade is an English name taken from the green gemstone, and it has no Irish form (“Séid” is actually the Irish verb “blow,” as in the wind). The Irish word for the stone is séad, an old word for a jewel or treasure, but it isn’t used as a given name.
🍀 Jemma
Pronunciation: Jem-ah
Meaning: Jemma is a spelling of Gemma, and there’s no Irish form (“Seama” is invented; the Irish word for gentle is séimh). Gemma itself originates from the Italian word for “jewel,” making it a fitting choice for a precious name.
🔥 Joanna (Siobhán)
Pronunciation: Shiv-awn
Meaning: The Irish equivalent of Joanna, Siobhán means “God is gracious.” Popular since the Norman invasion, it has graced Irish literature and history, with figures like Siobhán McKenna leaving a lasting legacy.
🍀 Johanna (Siobhán)
Pronunciation: Jo-han-ah (Siobhán: Shiv-awn)
Meaning: Johanna is the Latin feminine form of John, meaning “God is gracious,” and for generations it was one of the usual English forms of Siobhán in Ireland, alongside Joan and Hannah. It was far more common in the past: 146 Irish baby girls were named Johanna in 1964, compared with four in 2025.
🌊 Jean (Sinéad)
Pronunciation: Shin-ade
Meaning: An Irish version of Jean, Sinéad carries the same meaning: “God is gracious.” It became widely known through figures like singer Sinéad O’Connor, who gave the name international recognition.
🌟 Josie (Seosaimhín)
Pronunciation: Show-sa-veen
Meaning: A diminutive of Seosamh (Joseph), Seosaimhín means “God will increase.” Once common among Irish Catholic families, it retains an old-world charm while being effortlessly modern.
🌸 Juliette
Pronunciation: Joo-lee-et
Meaning: Juliette is the French form of Juliet, a pet form of Julia. There’s no separate Irish form (“Iúiléid” is invented), so Iúile, the Irish form of Julia, is the closest Irish link. Shakespeare’s Juliet made the name famous, and Juliette is a steady choice in Ireland, with 15 baby girls given it in 2025.
🎻 Jessie
Pronunciation: Jess-ee
Meaning: There’s no Irish form of Jessie (“Seasí” is invented). Jessie began as a Scottish pet form of Jean, and today it’s often associated with Jessica too.
🌿 Jolene
Pronunciation: Jo-leen
Meaning: There’s no Irish form of Jolene. The name was created in the early 20th century from Jo plus the name ending -lene, and it was popularized by the famous Dolly Parton song.
🌊 Jayla
Pronunciation: Jay-la
Meaning: Jayla is a modern American invention with no Irish form; séala is simply the Irish word for a seal, the kind you stamp on a letter. It’s rare here, given to just three Irish baby girls in 2024.
🍀 Janelle (Sinéad)
Pronunciation: Shin-ade
Meaning: A French-influenced diminutive of Jane, Janelle aligns with Sinéad, the Irish form of Jane, meaning “God is gracious.” Sinéad O’Connor brought this name global recognition, making it one of the most famous Irish names today.
🎶 Jovie
Pronunciation: Jo-vee
Meaning: There’s no Irish form of Jovie. It’s a modern name usually linked to the word jovial, from the Latin jovialis, meaning “of Jupiter.” It’s very rare in Ireland: the CSO has only recorded it once, for three baby girls in 2020.
🏹 Jessa
Pronunciation: Jess-ah
Meaning: Jessa is a short form of Jessica, with no Irish form (“Seasa” is invented). It’s a rare one in Ireland, recorded for four baby girls in 2017 and three in 2024.
🌿 Janis
Pronunciation: Jan-iss
Meaning: There’s no Gaelic version of Janis (“Seainis” is invented). It’s a variant of Janice, an elaboration of Jane, which itself comes from the Hebrew Yochanan, meaning “God is gracious.” Janis Joplin made this name iconic, giving it an association with soulful music and free-spirited energy.
🍀 Jaida
Pronunciation: Jay-da
Meaning: Jaida is a spelling of Jada, an elaborated form of Jade, so it’s connected to jade, the precious green stone. It has no Irish form and is rare in Ireland.
Irish Boys First Names that Start with J
As you can probably expect by now, boys’ names also don’t translate directly from English to Irish, but there are still some good ones to choose from.
⭐ Our Favourite: Jarlath (Iarlaith)
Pronunciation: JAR-lath (Iarlaith: EER-la)
First Used: St Jarlath (Iarlaithe), who founded a monastery at Tuam in the 6th century and is patron of the Archdiocese of Tuam
Meaning: The second half comes from flaith, meaning ‘ruler’ or ‘sovereign’; the meaning of the first part is unknown. Woulfe gives the Irish form as Iarfhlaith, usually spelled Iarlaith today.
Why It’s Our Favourite: Jarlath is one of the very few J names that’s Irish through and through, and the Irish spelling is on the rise: 68 baby boys were named Iarlaith in 2025, up from 13 in 2010.
🏰 James (Séamus)
Pronunciation: SHAY-mus
Meaning: An Irish form of James, Séamus comes from the Hebrew Ya’aqov, meaning ‘supplanter.’ It became popular after the Norman invasion of Ireland. Notable bearers include Séamus Heaney, the Nobel-winning poet, and many Irish revolutionaries. James is still one of Ireland’s favourites, ranked fourth for baby boys in 2025.
☘️ John (Seán)
Pronunciation: SHAWN
Meaning: Derived from the Hebrew Yochanan, meaning ‘God is gracious,’ Seán has been a staple in Irish history for centuries. It came in with the Anglo-Normans from the French Jehan, while the older Irish form, Eoin, has been used in Ireland since early Christian times. Seán O’Casey, the playwright, and Seán MacBride, the Nobel Peace Prize laureate, carried this name with pride.
🎭 Jack (Seán)
Pronunciation: JAK
Meaning: In Ireland, Jack is often a diminutive of Seán. It was the No. 1 boys’ name in Ireland in 21 of the 25 years from 2000 to 2024, and it ranked second behind Rían in 2025, as you’ll see in our guide to the most popular Irish baby names. Jack Charlton, the beloved manager of the Irish football team, is one of its best-loved bearers.
🌾 Joseph (Seosamh)
Pronunciation: SHOW-suv
Meaning: From the Hebrew Yosef, meaning ‘God will add,’ Seosamh has deep biblical roots. Seosamh Mac Grianna was a notable Irish writer, and the name is a common feature in Irish Catholic families.
🐑 Jacob (Iacób)
Pronunciation: YAH-kobe
Meaning: A name of biblical origin meaning ‘holder of the heel’ or ‘supplanter.’ Iacób is the Irish form of the biblical name, and Jacob is a popular choice in Ireland today, with 88 baby boys named Jacob in 2025.
🎶 Justin (Saorbhreathach)
Pronunciation: JUS-tin
Meaning: Rooted in the Latin Iustinus, meaning ‘just’ or ‘fair,’ Justin was used in Ireland as the English form of the old Irish name Saorbhreathach (Woulfe spells it Saerbhreathach), meaning ‘noble judge’ and once common among the MacCarthys. St. Justin Martyr, an early Christian martyr, gave the name its religious significance.
🌳 Jeremiah (Diarmaid)
Pronunciation: Jer-eh-MY-ah (Diarmaid: DEER-mid)
Meaning: Jeremiah is a Hebrew name, but in Ireland it was mostly used as the English stand-in for Diarmaid, which Woulfe noted in 1923 was “generally anglicised Jeremiah.” Diarmaid is the name of the hero of the tale of Diarmuid and Gráinne, and Jeremiah was once very common here, with 161 Irish baby boys given the name in 1964.
🎯 Jamie (Séamus)
Pronunciation: JAY-mee
Meaning: Jamie began as a Lowland Scots pet form of James, so its Irish equivalent is Séamus. It’s a big favourite in Ireland, with 112 baby boys named Jamie in 2025.
🏗️ Jaxon
Pronunciation: JAK-sun
Meaning: A modern variant of Jackson, meaning ‘son of Jack.’ There’s no Irish form (“Seacán” is invented), but Jaxon has caught on here, with 28 baby boys given the name in 2025.
🔥 Jax
Pronunciation: JAKS
Meaning: A modern short form of Jackson, meaning ‘son of Jack.’ It has no Irish form, but it’s a rising name in Ireland, with 16 baby boys named Jax in 2025.
🌱 Jayden
Pronunciation: JAY-den
Meaning: A modern American name, built on the same “-den” sound as Braden and Hayden, with no Irish form. Jayden has surged in popularity globally, favored for its soft yet strong sound.
Checked against Woulfe’s Irish Names and Surnames (1923), Ó Dónaill’s Foclóir Gaeilge-Béarla and the CSO’s baby name statistics for 1964 to 2025 in October 2026.
Frequently asked questions
Is there a J in the Irish alphabet?
No. The traditional Irish alphabet has 18 letters (a, b, c, d, e, f, g, h, i, l, m, n, o, p, r, s, t, u), so J only turns up in modern loanwords and borrowed names. That’s why the Irish forms of J names usually start with S or I, like Seán, Séamus or Iacób.
What is Jennifer in Irish?
There’s no traditional Irish form of Jennifer, which comes from a Cornish form of Guinevere. Fionnghuala is often suggested online, but it’s an unrelated Irish name meaning “fair-shouldered.”
What is the Irish for Jane?
Sinéad is the usual Irish form of Jane, and of Janet and Jenny too. It comes from the French Jeannette, and Woulfe also records the variant Sine in County Derry.
What does Jack mean in Irish?
Jack began as a pet form of John, so its Irish equivalent is Seán, from the Hebrew for “God is gracious.” It’s also one of Ireland’s most popular boys’ names, ranked No. 2 in 2025.
Are there any genuinely Irish names that start with J?
Jarlath (Iarlaith), after St Jarlath of Tuam, is the clearest example. Most other J names used in Ireland, like Jeremiah for Diarmaid or Julia for Síle, are English names that Irish families used in place of an Irish one.
Despite the difficulty with translation, there are still some great names to choose from that start with the letter J. You might also be interested in some of our other resources on Irish names. We also have a guide to Irish surnames, including a list of Irish last names that start with J.
