400+ Irish Last Names (With Meanings and Popularity)

Farrell is usually considered a boy's name, though the soft sound of this Irish surname makes it perfectly appropriate for a girl, reminiscent of Farrah.

Reilly and Riley are hugely popular, but O'Reilly is still an up-and-comer.

McCarthy is one of a wave of new Irish surname-names, one of the most popular last names of Irish origin now translated to a first name. Mac is an attractive nickname.

Undiscovered Irish surname with a lot more bounce and masculine dash than Shannon.

Irish surname that refers to High King Brian Boru, also spelled O'Brien. Makes a fabulous first name.

Kavanagh, which can also be spelled Cavanagh, Cavenagh, Kavanaugh, and Cavanaugh, is one of the few traditional Irish surnames not to start with Mc or O'. Kavanagh relates to the name first Kevin or Caomhan. Early kings of Leinster bore the name Kavanagh.

An uncommon Irish surname name with ties to nature, it would make a more distinctive alternative to the Scottish Lachlio. Lochran is one of those rare Irish baby names for boys not yet known in the US.

If you're looking for an Irish last name that moves beyond Casey and Cassidy, this one is pleasant sounding and worth considering. Kavanaugh, which can also be spelled Cavanagh, Cavenagh, Kavanagh, and Cavanaugh, is one of the few traditional Irish surnames not to start with Mc or O'. Kavanagh relates to the name first Kevin or Caomhan. Early kings of Leinster bore the name Kavanaugh.

Perfect as an updated namesake for Great-Uncle Neal (or Neil).

An Irish surname choice that could very well make its way into first name territory.

Anglicized form of Irish Ó Cearmada, which is reminiscent of other jaunty Irish surnames like Cassidy and Connolly.

An Irish surname choice that could very well make its way into first name territory.

A long shot, but it could join the crop of dashing Irish surname names.

Cullinan is an Irish surname that is unusual but accessible, with the unique nickname of Cully.

Trivia tidbit: The Cullinan diamond was the largest rough diamond ever found--over 3,000 carats--when it was unearthed in 1905.

Gary Sinise chose this Mc name for his late son McCanna, called Mac, in 1990, before Irish and Scottish surnames beginning with Mc or Mac became common as first names. Mac Sinise passed away from a rare form of cancer at the age of 33.

This Irish surname-name certainly feels brighter and fresher than the English equivalent, Clark.

McCabe is an Irish patronymic surname that originated with Scottish mercenaries in Ireland who wore distinctive hats -- or cabas, which is also the name for capes.

A common surname in Ireland, often use as an anglicization of Mac Giolla Phádraig. This name could honor a Patrick. It's also a way to get to Fitz as a nickname.