Mahon ~ Ó Mathghamhna

The Story of the Mahon Name

Mahon is an anglicized form of the Irish Ó Mathghamhna, meaning “descendant of Mathghamhain.” The personal name Mathghamhain is associated with the Irish word for “bear” and was an ancient name that carried an image of strength and ferocity.

The Mahon name has several distinct Irish origins, but one of its oldest traditions is rooted in County Clare. The Ó Mathghamhna of Thomond belonged to the wider Dál gCais tradition and were associated particularly with Corca Bhaiscinn, in the southwest of Clare.

Another important branch became established in County Cork. The Cork Ó Mathghamhna were associated with Cinel mBeice, now the barony of Kinelmeaky along the River Bandon. Their descendants became closely connected with the O'Mahony name, another form derived from the same ancient personal name.

Mahon is also closely related to McMahon, although the two forms became associated with different branches of the family. The MacMahons of Thomond and the MacMahons of Oriel in Ulster developed separate histories, with the latter becoming particularly associated with County Monaghan.

Behind the familiar name Mahon lies an ancient Gaelic name carrying the image of the bear and a history reaching back into the kingdoms of Munster. From Clare and Cork to the many forms the name eventually took in English, Ó Mathghamhna preserves the memory of families whose stories stretch deep into Ireland's medieval past.