The Harrington clan

The Barony of Kinalmeaky, County Cork, has one of the highest concentrations of the name Harrington, the Irish family name not to be confused with the English Harrington. Although some Harringtons living in Ireland undoubtedly come from English heritage, the Irish name in Gaelic was originally O hIongardail, which became anglicized as O'Hungerdell and then Harrington. FULL STORY >

The McCain Keane clans

The McCain family name originated in the Gaelic as O'Cathain, and is derived from Cathain, who was a ninth century ancestor of the King of Tara. Conchobar, son of Fergal Mac Mael Duin of the O'Neills, formed the O'Cahan sept, which came to be known as the "Warrior Clan of Ulster." The O'Cahan clan served as subordinate kings to the O'Neills who granted them the titles "King of Kianaght, King of Limavaday, and King of Fir-na-Creabh. FULL STORY >

The Malone clan

The name Malone derives from the Gaelic O'Maoileoin meaning follower of St. John. The family originally came from Ballynahown, County Offaly. FULL STORY >

The Duffy clan

The name Duffy is derived from dubh, the Gaelic for black. This is relatively unusual since the vast majority of Gaelic names are based on relationships, i.e. "Son of" or "Follower of." The Duffy name is derived from the Gaelic O'Dubhthaig and is mainly associated with County Monaghan. FULL STORY >

The Carlin clan

The Carlin name is found in County Limerick, where they held a family seat in ancient times, as well as in the counties of Meath, Derry, Cavan, Monaghan and Tyrone. The name is derived from the original Gaelic forms, O Caireallain and O Cearbhallain. FULL STORY >

• The Murphy clan
• The Kelly clan
• The O'Sullivan clan
• The Walsh, Welsh, or Brannagh clans
• The Carroll, O'Carroll, MacCarroll, MacCarvill, and MacCearbhaill clans
• The Brady clan
• The O'Brien Clan
• The Caulfield clan
• The Curran clan
• The O'Hara clan
• The Feeney clan
• The Sweeney clan
• The O'Flaherty clan
• The Hogan clan
• The Lynch clan
• The O'Reilly clan
• The Kennedy clan
• The McCarthy clan
• The Quinn clan
• The Doyle clan
• The Smith clan (Smith? Well, read on...)
• The Byrne clan (O'Byrne and O'Beirne)
• The Ryan clan
• The O'Connor clan
• The O'Neill clan
• The Kelleher clan
• The Dunne clan
• The Keough clan
• The Logan clan
• The Moloney clan
• The Haughey clan
• The Moran clan
• The Reidy clan
• The O'Malley clan
• The Fahy clan
• The Joyce clan
• The O'Donoghue clan