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The name Haughey is another Gaelic name, in this case deriving from the Irish O'hEachaidh.

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 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.

The Reidy family surname (also Reedy, Riedy, Reid, and O'Reidy) is an Anglicized version of the Gaelic name Riada. The family was part of the Dalcassian sept and in early Gaelic times lived in the southwest of Ireland, in the Munster counties of Clare and Kerry.