400+ Irish Last Names (With Meanings and Popularity)

Macaulee is a modern spelling variation of Macaulay or Macauley, a masculine name with Scottish and Irish Gaelic origins. The traditional name derives from 'Mac Amhalghaidh,' meaning 'son of Amhalghaidh' (an ancient Gaelic personal name). This contemporary spelling with the double 'e' ending gives the name a distinctive look while maintaining the original pronunciation. Historically, Macaulay was primarily a surname before transitioning to occasional use as a first name. The name gained some recognition through notable bearers like the historian Thomas Babington Macaulay and actor Macaulay Culkin. Macaulee offers the nickname possibilities of Mac or Lee, combining traditional Celtic heritage with a modern spelling twist.

Kearn is a masculine name with Celtic origins, primarily associated with Irish heritage. It likely derives from the Irish name Ciarán, meaning "little dark one" or "black," possibly referring to dark hair or complexion. Alternatively, it may relate to the Irish surname Ó Ceirín. As a given name, Kearn has remained quite rare throughout history, never appearing on mainstream popularity charts. The name carries a strong, concise sound that reflects its Celtic roots while being easy to pronounce in English-speaking countries. Kearn appeals to parents seeking a distinctive name with authentic Irish connections that isn't commonly used. Its brevity and strong consonant ending give it a masculine quality that contrasts with some of the softer-sounding Irish names.

Beagan is a masculine name of Irish Gaelic origin, derived from 'beag' meaning 'small' or 'little one.' Traditionally used as a surname in Ireland, it has transitioned to occasional first name usage, particularly among families celebrating their Celtic heritage. Beagan maintains an authentic Irish feel while being relatively straightforward to pronounce for English speakers. The name has never charted among popular names in the United States or United Kingdom, making it a distinctive choice that carries cultural significance without being commonplace. The sound is melodic yet masculine, with a pleasing rhythm that fits alongside other Irish names gaining international appreciation. Beagan offers the appeal of being recognizably Celtic without the pronunciation challenges of some traditional Irish names.

O'Neill is primarily known as an Irish surname meaning 'descendant of Niall,' derived from a legendary High King of Ireland named Niall of the Nine Hostages. As a first name, it represents a modern trend of using traditional surnames as given names. The distinctive apostrophe and capitalization pattern maintains its Irish heritage. While uncommon as a first name, it has gained modest traction among families celebrating Irish ancestry or seeking a strong, distinctive masculine name. O'Neill carries connotations of leadership and nobility through its historical connections. The name blends traditional Celtic heritage with contemporary naming trends. Though rare in formal records, it has increased in usage since the 1990s, particularly in Irish-American communities, appealing to parents seeking names with cultural significance and distinctive character.

O'Riley is a masculine surname-turned-first name of Irish origin. It's derived from the Gaelic surname Ó Raghailligh, meaning "descendant of Raghallach," a personal name thought to mean "valiant" or "rash in battle." The O' prefix traditionally denotes "grandson of" or "descendant of" in Irish naming traditions. As a first name, O'Riley represents the ongoing trend of using family surnames as given names, particularly in Irish-American communities. While not among the most common given names, it offers a distinctive option that honors Irish heritage while maintaining a contemporary feel.

Doogan is a rare masculine name with Irish and Scottish Gaelic origins. It likely developed as an anglicized form of the Gaelic surname Ó Dubháin, meaning 'descendant of Dubhán' (where Dubhán means 'little dark one'). As a first name, Doogan has remained uncommon but carries a distinctive Celtic charm. It fits within the trend of using traditional surnames as given names, appealing to parents seeking something unique with authentic cultural roots. The name has a strong, memorable sound with its two distinct syllables and hard consonants. While not widely used, Doogan offers a fresh alternative to popular Irish names like Declan or Liam, while still conveying a sense of heritage and rugged individuality.