McMahon (surname)

McMahon or MacMahon (/məkˈmæn/ mək-MAN or /məkˈmɑːn/ mək-MAHN; older Irish orthography: Mac Mathghamhna; reformed Irish orthography: Mac Mathúna; meaning "son of the bear") is an Irish surname.

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. According to historian C. Thomas Cairney, the MacMahons were one of the chiefly families of the Dal gCais or Dalcassians who were a tribe of the Erainn who were the second wave of Celts to settle in Ireland between about 500 and 100 BC.

McMahon or MacMahon is the surname of the following people:

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