Ó Mathúna / O'Mahony

O'Mahony Family Crest


The name Ó Mathghamhna (in modernised spelling Ó Mathúna) is derived from Mathghamhan or Mahon: son of Cian Mac Mael Muda, the tenth-century warrior-prince, and Sadbh, daughter of the High King of Ireland, Brian Boru (killed in the Battle of Clontarf in 1014).


Mathghamhan's ancestors were known as the Eoghanacht Raithline, a branch of that great group of dynasties claiming descent from Eoghan Mor, son of Oilioll Olum who, in the second century was reputedly first King of Munster.


The O'Mahonys occupied a huge tract of Munster, stretching from the environs of Cork city to Mizen Head. The sept owned this land until the seventeenth century when, in common with other Gaelic families in those stormy times, they were dispossessed.

 Variations: Mahoney, etc.