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The surname came into use around the 11th century by two different Irish clans: The MacMahons of Thomond, a sept of the Dál gCais, and the MacMahons of Oriel, rulers of Airgíalla. Additionally, a separate McMahon family in County Fermanagh is descended from Mahon Maguire, a grandson of Donn Carrach Maguire. [2]
The surname McMahon was first found in County Clare (Irish: An Clár) located on the west coast of Ireland in the province of Munster, where the MacMahons were lords of Corca Baisgin; and possessed the greater part of the baronies of Moyarta and Clonderlaw.
McMahon is an anglicized form of the Old Gaelic MacMathghamhna, a patronymic from the byname Mathghamhain, meaning “bear.” Two distinct septs of this name existed in Ireland, one in county Clare and the other in and around present-day Monaghan.
Origin of the Surname. McMahon is a distinguished Irish surname with a rich historical significance, closely tied to Ireland’s historical narrative. Etymology and Meaning. The McMahon surname is an anglicized form of the original Gaelic “Mac Mathúna,” where “Mac” means “son” and “Mathúna” is derived from “mathghamhain,” which translates to “bear.”
The Mcmahon family name was found in the USA, the UK, Canada, and Scotland between 1840 and 1920. The most Mcmahon families were found in USA in 1880. In 1891 there were 537 Mcmahon families living in Lancashire.
The first belong to County Clare, and are descended from Mahon, son of Murtagh Mor O'Brien, King of Ireland (deceased 1119). Their territory was Corcabaskin in West Clare where the name is still most numerous. The last inaugurated Chief of the Name fell at the Battle of Kinsale in 1602.
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The surname McMahon is of Irish origin and is derived from the Gaelic name Mac Mathghamhna, meaning "son of Mathghamhain." Mathghamhain is a personal name that is believed to have originated from the Old Irish word "math," meaning "bear."
