Irish last names carry centuries of deep history and culture. Many common surnames trace back to traditional Gaelic patronymic naming systems. You will often spot prefixes like O or Mac, which simply mean “descendant of” or “son of” in the old language.
We rounded up the most popular Irish family names and uncovered their fascinating origins. Check out the meanings behind these classic names to see if your family tree has roots in Ireland.
102 Impressive and Inspiring Irish Last Names
Here are 102 of the most popular and culturally significant Irish last names, along with their traditional meanings.
- Ahern: Meaning “lord of horses,” Ahern is a rare yet valiant pick among Irish last names for boys.
- Angus: A typically Gaelic name meaning “one strength,” traditionally spelled Aonghus.
- Ardan: Meaning “high aspiration,” this stylish yet old Irish surname and given name is perfect for dreamers.
- Barry: For a “descendant of Beargh,” with the pirate-ready meaning of “plunderer.”
- Beckett: Brought to Ireland by settlers, this “little brook” surname is best associated with Irish novelist Samuel Beckett.
- Behan: Denotes a “descendant of Beachain,” a buzz-worthy name meaning “bee.”
- Bell: This common English surname sure has a nice ring, denoting a “bell ringer.”
- Boyle: One of the most common surnames in Northern Ireland, perhaps meaning “profitable.”
- Braden: A fishy surname for a “descendant of Bradán,” meaning “salmon.”
- Brady: A joyful Irish surname from Ó Brádaigh, meaning “spirited.”
- Brannigan: Cunning and slightly spooky, this animal-inspired name means “raven.”
- Brennan: Like Brannigan, Brennan also has the “raven” meaning behind this cool name.
- Breslin: A fun-sounding Irish surname with the serious meaning of “strife.”
- Brian: An elevated and common Celtic given name and surname, meaning “high, noble.”
- Brody: A strong Gaelic surname and given name with the rugged, earthy meaning of “muddy place, ridge.”
- Brogan: Meaning “shoe,” this Irish surname could perhaps denote a shoemaker.
- Brophy: Meaning “son of Bróth” after a medieval forename.
- Brown: This internationally common color surname is frequently heard in Ireland.
- Buckley: An Irish name meaning “boy,” or an English name meaning “buck lea.”
- Burke: With Middle English roots, this strong name means “fortress, castle.”
- Byrne: A strong, confident choice for a “son of Bran,” with Bran meaning “raven.”
- Cahill: A variant of Cathal, for a family who is “strong in battle.”
- Callaghan: A handsome surname for a “bright-headed” descendant.
- Campbell: With Scottish and Northern Irish roots, Campbell has the unique meaning of “crooked mouth.”
- Caomhánach: An old, traditional, and royal Irish name meaning “friendly, dear, merciful.”
- Carroll: Or Carrell, from the traditional Irish Ó Cearbhaill, meaning “sharp” or “fierce warrior.”
- Cassidy: Meaning “curly-haired,” this surname is a popular modern pick.
- Cathal: A name fit for warriors, meaning “battle ruler” or “strong in war.”
- Cleary: Used for a “scribe, cleric,” or one descended from someone of this occupation.
- Comiskey: A perky pick among Irish surnames with uncertain historical meaning.
- Connell: From the given name Conall, meaning “strong wolf,” for families that love nature.
- Connery: A variant of Conroy, great for classic movie fans.
- Connolly: For a “descendent of Conghal,” itself with the fierce meaning of “fierce as a hound.”
- Conroy: Derived from the Irish name Conaire, meaning “hound keeper.”
- Coulter: Rooted in Scottish and Irish culture, with various potential meanings, including “back land.”
- Coyne: For a “descendant of Cadhan,” after an Irish name meaning “wild goose.”
- Daly: Or Daley, derived from Ó’Dálaigh, meaning “assembly” or “one who is present at gatherings.”
- Delaney: A feisty surname and unisex given name with mischievous connotations, meaning “dark and defiant.”
- Donoghue: If you have brown-haired descendants, this cool surname would be a fitting option for your family.
- Donovan: A traditional Gaelic surname from the kingly Donnubán root, meaning “dark.”
- Doyle: A highly common name for a “dark stranger,” Doyle ranks among the most frequent Irish family names.
- Driscoll: Meaning “descendant of the news-bearer,” this is a surname worth shouting about.
- Dubhán: An Old Irish surname meaning “little dark one.”
- Duffy: A fun pick rooted in the Old Irish Dubthach, meaning “black, dark.”
- Dunne: Meaning “dark,” Dunne is one of the more mysterious and intriguing Irish family names.
- Enright: A fiery Irish surname said to mean “attacker.”
- Farrell: An earthy name derived from the Irish name Ó Fearghail, meaning “man of valor.”
- Finn: Short, sweet, and simple, with the angelic meaning of “fair.”
- Finnegan: A fun, upbeat surname meaning “fair-haired.”
- Finneran: Similarly to Finnegan, Finneran means “fair lord.”
- Fitzpatrick: For a “son of Patrick,” this makes an amazingly patriotic Irish surname.
- Flanagan: A quintessential Irish surname with the intense meaning of “blood-red.”
- Flood: A traditional surname in Ireland, meaning “flood, stream.”
- Fogarty: From O’Fogartaigh, with the distinct meaning of “banished” or “exiled.”
- Foley: Another great pick for a family with nautical roots, meaning “plunderer.”
- Glenn: Or Glyn, an uncommon yet calming name meaning “from the valley” in Irish.
- Guinness: A globally recognized name derived as a shorter form of McGuinness.
- Halligan: An especially radiant pick for a “descendant of Áilleagán,” meaning “beautiful” or “handsome.”
- Hennessey: A friendly-sounding name for someone of Irish descent, derived from the same stem as Angus.
- Kavanagh: Or Kavanaugh, both recognizable variations of the traditional Irish Caomhánach.
- Keating: A handsome English and Irish surname, perhaps meaning “kite.”
- Keller: An Irish name possibly meaning “companion” and “cellar” as a German surname.
- Kelly: This second-most common Irish surname shines with its meaning of “bright-headed warrior.”
- Lalor: Meaning “leper” or “weak person,” this traditional surname carries a humble origin story.
- Lynch: Meaning “descendant of Loingseach,” itself a given name meaning “mariner” or “ship owner.”
- Magennis: Meaning “son of Angus,” Magennis is a strong and traditional Irish clan name.
- Mahoney: Meaning “descendant of the bear,” this name carries a commanding yet cuddly presence.
- McCarthy: A beautifully touching tribute to a name, meaning “son of the loving one.”
- McGuinness: A commonly-heard variant of Magennis, also meaning “son of Angus.”
- Minogue: A celebrity surname meaning “descendant of Muineog,” itself a given name meaning “monk.”
- Molloy: A family name to carry with pride, descended from a “proud chieftain.”
- Mooney: Sounds like “money” for a reason, as this cool Gaelic name means “descendant of the wealthy.”
- Moriarty: A much-shorter alternative to the traditional Ó Muircheartaigh, meaning “navigator” or “sea-skilled.”
- Morrigan: If you like names meaning death, this mythological goddess of suffering makes a chilling namesake.
- Morris: Popular in southern Ireland, this cool name fits a family “of the marsh.”
- Muir: Few Irish surnames are as outdoorsy and adventurous as Muir, meaning “sea” in Gaelic.
- Munro: A Scottish name, yet used to refer to a “man from the River Roe” in Northern Ireland.
- Murphy: The most frequently-found Irish surname, carries the epic meaning of “sea warrior.”
- Murray: A common name from a tangle of possible roots and origins in Irish and Scottish history.
- Nevin: A cute Irish and Scottish surname meaning “little saint” or “little bone.”
- Nolan: Meaning “noble” or “famous,” this name commands respect.
- O’Brien: One of the most aristocratic of Irish family names, meaning “hill, high, noble.”
- O’Clery: One of the oldest Irish surnames meaning “secretary, scribe,” like the similar variant Cleary.
- O’Connor: A commonly-heard variant from the Irish Conor stem, meaning “lover of hounds” or “wolf.”
- O’Keeffe: A clan name derived from the word “caomh,” meaning “kind” or “gentle.”
- O’Neill: For a “descendant of Niall,” this common surname is rooted in the Irish name meaning “champion.”
- O’Reilly: Like Reilly, this is a common name derived from the traditional Irish Ó Raghailligh.
- O’Sullivan: Meaning “dark eyes” or “hawk-eyed,” a popular pick among Irish Americans.
- O’Toole: A classic surname derived from the Irish given name Túathal, meaning “prince of the people.”
- Patrick: Borne by the patron saint of Ireland, this noble Latin name means “nobleman” or “ruler.”
- Quinn: A unisex Irish given name and surname derived from Conn, meaning “chief.”
- Reilly: With O’Reilly, one of the most popular Irish surnames, perhaps meaning “sociable” or “extroverted.”
- Ryan: A highly common Irish surname and given name for a “descendant of Rian,” meaning “little king.”
- Shannon: A great locational name and surname with the beautiful meanings of “wise river” or “skilled storyteller.”
- Shay: A cool variation of the Irish surname Shea, also possessing Hebrew roots.
- Shea: A modern-sounding, earthy surname for a “learned” or “favorable” family.
- Sheridan: A strong, historic name meaning “descendant of the searcher.”
- Smith: An occupational surname meaning “blacksmith,” highly prevalent in Ireland and English-speaking countries.
- Sullivan: Meaning “dark eyes,” this cool name holds quite the allure.
- Sweeney: A notable clan name meaning “descendant of Suibhne,” translating to “pleasant.”
- Tracy: Meaning “fighter,” a great pick among British and Irish family names for resilient families.
- Walsh: A top five most common Irish surname, meaning “foreigner,” historically referring to a “Welshman.”
Irish Last Names FAQs
What Does It Mean When Irish Surnames Begin With O’ or Fitz?
O’ and Fitz aren’t surnames themselves, but people use them regularly as prefixes in many traditional Irish last names. Both are patronymic in meaning, denoting a “son of” or “grandson of,” and they are followed by a family given name. For instance, Fitzpatrick means “son of Patrick,” and O’Connor translates to “descendant of Connor.”
What Are the Most Common Last Names in Ireland?
Murphy is the most commonly heard surname in Ireland. Kelly, Byrne, Walsh, Ryan, O’Connor, O’Sullivan, O’Brien, and O’Neill are also highly prevalent around the country and the rest of the world.
How Do You Say Last Name in Irish?
The Irish word for last name or surname is “sloinne.” If you want to ask someone their last name, you would simply say “Cad is sloinne duit?”
Why Do Some Irish Names Start With Mac or Mc?
The prefixes Mac and Mc both translate to “son of” in the Gaelic language. Historically, families used them to identify a person by their father’s given name.
Are Irish and Scottish Last Names the Same?
While they share many similarities due to shared Celtic roots, Irish and Scottish surnames are distinct. You will find overlap with prefixes like Mac, but specific clan names often remain unique to their respective countries.
Did Irish Immigrants Change Their Last Names?
Many Irish families simplified their surnames after immigrating to English-speaking countries like the United States. They often dropped traditional prefixes like O or Mac to blend in more easily.
What Is the Oldest Recorded Irish Surname?
O’Clery is widely considered the oldest recorded surname in Ireland. Historians trace it back to the year 916 when the Lord of Aidhne passed away.
Do Irish Surnames Have Different Spellings for Males and Females?
Yes, traditional Gaelic naming conventions alter the prefix based on gender. For example, a male might use O to mean “grandson of,” while a female uses Ni to mean “daughter of a descendant.”
