Irish last names carry deep Celtic and Gaelic history. They reflect culture and family heritage. Many surnames trace back to an old Irish clan. Some come from geography.

Others come from an occupation. Some come from a distant ancestor’s first name. Each name holds a piece of Ireland’s rich history.

Do you want to discover your family roots? Or find a meaningful Irish surname for your child? This guide is for you. In this article, we’ll explore popular Irish last names.

We’ll cover their meanings and origins. We’ll also look at their cultural significance. Each surname has Gaelic roots. Each one has its own historical background. This is especially helpful for genealogy research. Let’s take a closer look into the world of Irish last names.

Why Irish Last Names Matter Today

Irish last names connect people to centuries of history and culture. They tell stories about a family’s clan, land, or trade from long ago.

Many people search for Irish last names to learn about their own roots. Understanding these names helps preserve Ireland’s rich heritage for future generations.

Irish Last Names and Meanings

Irish last names and meanings connect families to centuries of Celtic and Gaelic history. Many surnames come from a clan chief, a piece of land, or a trade passed down through generations.

Learning the meaning behind a name reveals a hidden story about where a family came from. This list covers some of the most recognized Irish surnames and what they mean.

Name	Meaning	Origin
Murphy	Sea warrior	Gaelic
Kelly	Bright-headed	Gaelic
O’Sullivan	Dark-eyed one	Gaelic
Walsh	Welshman	Anglo-Norman
O’Brien	Descendant of Brian	Gaelic
Byrne	Raven	Gaelic
Ryan	Little king	Gaelic
O’Connor	Descendant of Conchobhar	Gaelic
O’Neill	Descendant of Niall	Gaelic
O’Reilly	Descendant of Raghallach	Gaelic
Doyle	Dark stranger	Gaelic
McCarthy	Descendant of Carthach	Gaelic
Gallagher	Foreign helper	Gaelic
O’Doherty	Descendant of Dochartach	Gaelic
Kennedy	Helmeted head	Gaelic
Lynch	Mariner	Gaelic
Murray	Lord or sea warrior	Gaelic
Quinn	Descendant of Conn	Gaelic
Moore	Great one	Gaelic
McLoughlin	Descendant of Lochlainn	Gaelic
Carroll	Champion warrior	Gaelic
Connolly	Fierce as a wolf	Gaelic
Daly	Assembly gatherer	Gaelic
O’Connell	Strong wolf	Gaelic
Dunne	Brown-haired	Gaelic
Brennan	Little raven	Gaelic
Burke	Fortified place	Anglo-Norman
Collins	Whelp or young dog	Gaelic
Fitzgerald	Son of Gerald	Anglo-Norman
Nolan	Descendant of the noble one	Gaelic

Irish Last Names Mc

Irish last names starting with Mc trace back to the Gaelic word “mac,” meaning “son of.” These surnames often point to a father’s first name, occupation, or clan title.

Many Mc surnames spread widely from Ulster and Connacht. Below is a list of common Mc surnames and their roots.

Name	Meaning	Origin
McCarthy	Son of Carthach	Gaelic
McDonnell	Son of Domhnall	Gaelic
McDermott	Son of Diarmaid	Gaelic
McGuire	Son of Odhar	Gaelic
McLoughlin	Son of Lochlainn	Gaelic
McNamara	Son of the hound of the sea	Gaelic
McMahon	Son of the bear	Gaelic
McKenna	Son of Cionaodh	Gaelic
McGrath	Son of grace	Gaelic
McCormack	Son of Cormac	Gaelic
McGovern	Son of the rough one	Gaelic
McDaid	Son of David	Gaelic
McCabe	Son of the helmeted one	Gaelic
McArdle	Son of high valor	Gaelic
McAuley	Son of Amhalghaidh	Gaelic
McElroy	Son of the red-haired youth	Gaelic
McGann	Son of the fair one	Gaelic
McGlynn	Son of the servant of the church	Gaelic
McHugh	Son of Aodh	Gaelic
McInerney	Son of the steward	Gaelic
McKeever	Son of Ivor	Gaelic
McKeown	Son of Eoghan	Gaelic
McShane	Son of John	Gaelic
McTiernan	Son of the lord	Gaelic
McVeigh	Son of the poet	Gaelic
McWilliams	Son of William	Anglo-Gaelic
McAvoy	Son of Aodh Buí	Gaelic
McBride	Son of the follower of Brigid	Gaelic
McCafferty	Son of Cafarta	Gaelic
McCauley	Son of Amhalghaidh	Gaelic

Irish Last Names That Start With M

Irish last names that start with M carry deep roots in Munster, Connacht, and Leinster. Some point to a clan name, others to geography or a personal trait.

These surnames remain common across Ireland and among the Irish diaspora today. Here is a list of surnames beginning with the letter M.

Name	Meaning	Origin
Murphy	Sea warrior	Gaelic
Molloy	Majestic chief	Gaelic
Moore	Great one	Gaelic
Mullan	Bald or bare hill	Gaelic
Malone	Devotee of Saint John	Gaelic
Maguire	Son of Odhar	Gaelic
Mahon	Bear	Gaelic
Martin	Descendant of Martin	Anglo-Norman
Meehan	Descendant of the honorable one	Gaelic
Molony	Servant of Saint Luan	Gaelic
Monaghan	Monk-like	Gaelic
Moran	Great in number	Gaelic
Morrissey	Choice of the sea	Gaelic
Mulcahy	Descendant of the war hound	Gaelic
Mulligan	Descendant of the bald chief	Gaelic
Mulryan	Descendant of little Ryan	Gaelic
Murray	Lord or sea warrior	Gaelic
Meagher	Generous or hospitable	Gaelic
Meade	Middle	Anglo-Norman
Merrigan	Descendant of the sprightly one	Gaelic
Mescall	Descendant of the wanderer	Gaelic
Milligan	Little bald one	Gaelic
Mitchell	Descendant of Michael	Anglo-Norman
Mooney	Descendant of the wealthy one	Gaelic
Moriarty	Skilled navigator	Gaelic
Mulvihill	Descendant of the bald chief	Gaelic
Mulhall	Descendant of the noble prince	Gaelic
Madden	Descendant of the little dog	Gaelic
Melia	Descendant of the honorable chief	Gaelic
Mangan	Little monk	Gaelic

Irish Last Names Starting With O

Irish last names starting with O come from the Gaelic prefix “Ó,” meaning “descendant of.” These names honor a specific ancestor, often a clan founder from centuries ago.

The O prefix was dropped by many families under English rule and later restored. Below is a list of surnames starting with O.

Name	Meaning	Origin
O’Brien	Descendant of Brian	Gaelic
O’Sullivan	Descendant of the dark-eyed one	Gaelic
O’Connor	Descendant of Conchobhar	Gaelic
O’Neill	Descendant of Niall	Gaelic
O’Reilly	Descendant of Raghallach	Gaelic
O’Doherty	Descendant of Dochartach	Gaelic
O’Connell	Descendant of the strong wolf	Gaelic
O’Donnell	Descendant of Domhnall	Gaelic
O’Callaghan	Descendant of the bright-headed one	Gaelic
O’Farrell	Descendant of the man of valor	Gaelic
O’Grady	Descendant of the illustrious one	Gaelic
O’Hara	Descendant of the sharp one	Gaelic
O’Keeffe	Descendant of the gentle one	Gaelic
O’Leary	Descendant of the cattle keeper	Gaelic
O’Mahony	Descendant of the bear	Gaelic
O’Malley	Descendant of the chief of the fleet	Gaelic
O’Meara	Descendant of the mirthful one	Gaelic
O’Rourke	Descendant of Ruarc	Gaelic
O’Shea	Descendant of the stately one	Gaelic
O’Toole	Descendant of the ruler of the people	Gaelic
O’Dwyer	Descendant of the dark wise one	Gaelic
O’Dea	Descendant of the fire	Gaelic
O’Halloran	Descendant of the stranger from overseas	Gaelic
O’Hanlon	Descendant of the little champion	Gaelic
O’Hare	Descendant of the sharp one	Gaelic
O’Kane	Descendant of the ancient one	Gaelic
O’Kelly	Descendant of the bright-headed one	Gaelic
O’Loughlin	Descendant of Lochlainn	Gaelic
O’Regan	Descendant of the little king	Gaelic
O’Riordan	Descendant of the royal poet	Gaelic

Irish Last Names That Start With M

Irish last names that start with C reflect clan names, geography, and old Gaelic titles. Many families with C surnames trace roots to Munster or Ulster.

Some names later changed spelling after English influence. Here is a list of surnames beginning with the letter C.

Name	Meaning	Origin
Carroll	Champion warrior	Gaelic
Connolly	Fierce as a wolf	Gaelic
Collins	Whelp or young dog	Gaelic
Casey	Vigilant or watchful	Gaelic
Clarke	Clerk or scholar	Anglo-Norman
Cassidy	Descendant of the curly-haired one	Gaelic
Cahill	Descendant of the battle-loving one	Gaelic
Callaghan	Descendant of the bright-headed one	Gaelic
Campbell	Crooked mouth	Scots-Gaelic
Cannon	Descendant of the wolf cub	Gaelic
Carey	Descendant of the dark one	Gaelic
Carey (O’Ciardha)	Dark one	Gaelic
Carney	Descendant of the victorious one	Gaelic
Cleary	Descendant of the clerk	Gaelic
Coffey	Descendant of the victorious one	Gaelic
Cogan	Descendant of the fifth one	Gaelic
Colligan	Little dove	Gaelic
Conlon	Descendant of the hero	Gaelic
Connell	Strong as a wolf	Gaelic
Conroy	Descendant of the wise counselor	Gaelic
Considine	Descendant of the resolute one	Gaelic
Corbett	Raven	Anglo-Norman
Corcoran	Purple or ruddy complexion	Gaelic
Costello	Descendant of Oisdealbh	Gaelic
Cotter	Descendant of the champion	Gaelic
Coyle	Descendant of the battle-loving one	Gaelic
Cregan	Descendant of the little branch	Gaelic
Cronin	Descendant of the swarthy one	Gaelic
Cullen	Handsome one	Gaelic
Curran	Descendant of the hero	Gaelic

Irish Last Names Male

Irish last names male lists often highlight strong, traditional surnames tied to warriors, chiefs, and clan founders. These names carry a sense of strength and heritage passed through generations of men.

Many remain common first or middle names as well as surnames today. Below is a list of strong, traditional Irish surnames.

Name	Meaning	Origin
Ryan	Little king	Gaelic
Kennedy	Helmeted head	Gaelic
Brennan	Little raven	Gaelic
Duffy	Dark-complexioned	Gaelic
Fitzpatrick	Son of Patrick	Anglo-Norman
Flynn	Son of the red-haired one	Gaelic
Boland	Descendant of the strong one	Gaelic
Brady	Descendant of the spirited one	Gaelic
Barry	Descendant of the spear-like one	Gaelic
Carey	Dark one	Gaelic
Devlin	Descendant of the fierce valor	Gaelic
Doran	Descendant of the exile	Gaelic
Dowling	Descendant of the dark stranger	Gaelic
Egan	Little fire	Gaelic
Fagan	Descendant of the little raven	Gaelic
Finnegan	Descendant of the fair one	Gaelic
Gaffney	Descendant of the calf	Gaelic
Grady	Descendant of the illustrious one	Gaelic
Hanley	Descendant of the champion	Gaelic
Hogan	Youthful one	Gaelic
Keane	Ancient or strong	Gaelic
Kearney	Descendant of the victorious one	Gaelic
Lynch	Mariner	Gaelic
Maguire	Son of Odhar	Gaelic
Nolan	Descendant of the noble one	Gaelic
Power	Poor or humble	Anglo-Norman
Quinlan	Descendant of the strong-shaped one	Gaelic
Regan	Little king	Gaelic
Sheehan	Descendant of the peaceful one	Gaelic
Whelan	Descendant of the wolf	Gaelic

Irish Last Names That Start With D

Irish last names that start with D come from old Gaelic clans, occupations, and physical traits. Many D surnames spread from Leinster and Munster across the country.

These names remain widely used among Irish families today. Here is a list of surnames beginning with the letter D.

Name	Meaning	Origin
Doyle	Dark stranger	Gaelic
Dunne	Brown-haired	Gaelic
Daly	Assembly gatherer	Gaelic
Duffy	Dark-complexioned	Gaelic
Devlin	Descendant of the fierce valor	Gaelic
Doran	Descendant of the exile	Gaelic
Dowling	Descendant of the dark stranger	Gaelic
Dwyer	Dark wise one	Gaelic
Delaney	Descendant of the challenger	Gaelic
Dempsey	Proud one	Gaelic
Dillon	Loyal or faithful	Anglo-Norman
Donnelly	Brown-haired warrior	Gaelic
Donovan	Dark-haired chieftain	Gaelic
Dooley	Dark hero	Gaelic
Doran	Exile or stranger	Gaelic
Dorney	Descendant of the exile	Gaelic
Dowd	Descendant of the dark-haired one	Gaelic
Downey	Descendant of the brown-haired one	Gaelic
Drennan	Descendant of the thorn bush	Gaelic
Duggan	Descendant of the dark one	Gaelic
Dunphy	Descendant of the brown soldier	Gaelic
Durkin	Descendant of the champion	Gaelic
Dalton	Town in the valley	Anglo-Norman
Darcy	Dark one	Anglo-Norman
Deasy	Descendant of the southerner	Gaelic
Dennehy	Descendant of the small dark one	Gaelic
Devane	Descendant of the poet	Gaelic
Devitt	Son of David	Gaelic
Dinneen	Little dark one	Gaelic
Dolan	Descendant of the dark-haired chief	Gaelic

Irish Last Names That Start With S

Irish last names that start with S reflect clan history, geography, and old trades. Many S surnames come from Munster, Ulster, and Leinster clans.

These names remain common throughout Ireland and among the Irish diaspora. Below is a list of surnames beginning with the letter S.

Name	Meaning	Origin
Sullivan	Dark-eyed one	Gaelic
Sheehan	Descendant of the peaceful one	Gaelic
Shea	Descendant of the stately one	Gaelic
Sheridan	Descendant of the seeker	Gaelic
Smith	Metalworker	Anglo-Saxon
Slattery	Descendant of the strong-armed one	Gaelic
Scanlon	Little snarer	Gaelic
Sexton	Church official	Anglo-Norman
Shanahan	Descendant of the wise old one	Gaelic
Sheedy	Descendant of the peaceful one	Gaelic
Skelly	Descendant of the storyteller	Gaelic
Slavin	Descendant of the mountain man	Gaelic
Smyth	Metalworker	Anglo-Saxon
Somers	Summer traveler	Anglo-Norman
Spillane	Descendant of the little spade	Gaelic
Stack	Descendant of the projecting rock	Norse-Gaelic
Stanton	Stone settlement	Anglo-Norman
Staunton	Stone settlement	Anglo-Norman
Sweeney	Descendant of the little hero	Gaelic
Synan	Descendant of the storm	Gaelic
Sammon	Descendant of the old one	Gaelic
Savage	Wild or untamed	Anglo-Norman
Scully	Town crier	Gaelic
Shanley	Descendant of the old hero	Gaelic
Sharkey	Descendant of the fox-like one	Gaelic
Sherlock	Fair-haired	Anglo-Norman
Sherry	Descendant of the freeman	Gaelic
Shine	Descendant of the storm	Gaelic
Sirr	Descendant of the free one	Gaelic
Skerritt	Descendant of the wanderer	Anglo-Norman

Common Irish Last Names

Common Irish last names appear across every county in Ireland and among millions in the Irish diaspora. These surnames often trace back to a single clan founder or geographic marker.

Their widespread use makes them familiar names around the world today. Here is a list of the most common Irish surnames.

Name	Meaning	Origin
Murphy	Sea warrior	Gaelic
Kelly	Bright-headed	Gaelic
O’Sullivan	Dark-eyed one	Gaelic
Walsh	Welshman	Anglo-Norman
Smith	Metalworker	Anglo-Saxon
O’Brien	Descendant of Brian	Gaelic
Byrne	Raven	Gaelic
Ryan	Little king	Gaelic
O’Connor	Descendant of Conchobhar	Gaelic
O’Neill	Descendant of Niall	Gaelic
O’Reilly	Descendant of Raghallach	Gaelic
Doyle	Dark stranger	Gaelic
McCarthy	Descendant of Carthach	Gaelic
Gallagher	Foreign helper	Gaelic
O’Doherty	Descendant of Dochartach	Gaelic
Kennedy	Helmeted head	Gaelic
Lynch	Mariner	Gaelic
Murray	Lord or sea warrior	Gaelic
Quinn	Descendant of Conn	Gaelic
Moore	Great one	Gaelic
McLoughlin	Descendant of Lochlainn	Gaelic
Carroll	Champion warrior	Gaelic
Connolly	Fierce as a wolf	Gaelic
Daly	Assembly gatherer	Gaelic
O’Connell	Strong wolf	Gaelic
Wilson	Son of William	Anglo-Saxon
Dunne	Brown-haired	Gaelic
Brennan	Little raven	Gaelic
Burke	Fortified place	Anglo-Norman
Collins	Whelp or young dog	Gaelic

Popular Irish Last Names

Popular Irish last names remain widely used today thanks to Ireland’s global diaspora and long clan history. Many of these names appear often in film, sport, and public life.

Their popularity keeps Irish heritage visible around the world. Below is a list of the most popular Irish surnames.

Name	Meaning	Origin
Murphy	Sea warrior	Gaelic
Kelly	Bright-headed	Gaelic
O’Sullivan	Dark-eyed one	Gaelic
Walsh	Welshman	Anglo-Norman
O’Brien	Descendant of Brian	Gaelic
Ryan	Little king	Gaelic
Byrne	Raven	Gaelic
O’Connor	Descendant of Conchobhar	Gaelic
McCarthy	Descendant of Carthach	Gaelic
Gallagher	Foreign helper	Gaelic
Kennedy	Helmeted head	Gaelic
Lynch	Mariner	Gaelic
Murray	Lord or sea warrior	Gaelic
Quinn	Descendant of Conn	Gaelic
Fitzgerald	Son of Gerald	Anglo-Norman
Doyle	Dark stranger	Gaelic
Nolan	Descendant of the noble one	Gaelic
Moran	Great in number	Gaelic
Sheehan	Descendant of the peaceful one	Gaelic
Flynn	Son of the red-haired one	Gaelic
Cassidy	Descendant of the curly-haired one	Gaelic
Brady	Descendant of the spirited one	Gaelic
Casey	Vigilant or watchful	Gaelic
Riordan	Royal poet	Gaelic
Malone	Devotee of Saint John	Gaelic
Duffy	Dark-complexioned	Gaelic
Hogan	Youthful one	Gaelic
Whelan	Descendant of the wolf	Gaelic
Cullen	Handsome one	Gaelic
Barry	Descendant of the spear-like one	Gaelic

How to Choose Irish Last Names

Choosing an Irish last name often comes down to the story you want it to tell. Some families look for a surname tied to a specific county or clan history. Others prefer a name based on meaning — strength, nature, or heritage.

Knowing the roots behind a name makes the choice more meaningful.

1. Consider the meaning behind the name (warrior, chief, nature, trade)
2. Check the regional origin (Munster, Ulster, Connacht, Leinster)
3. Decide between Gaelic (“O’/Mc”) or Anglo-Norman roots
4. Think about pronunciation and spelling ease for daily use

Conclusion

Irish last names carry centuries of history in a few syllables. Whether a name points to a warrior, a chief, or a simple trade, each surname tells its own story. Gaelic names starting with “O'” or “Mc” often trace back to a specific ancestor or clan founder.

Anglo-Norman surnames reflect a different chapter, shaped by settlers who arrived later. Choosing a name today can honor family roots or celebrate Irish heritage. Learning the meaning and origin gives extra depth to a name. In the end, every Irish surname is a small piece of a much larger story.

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