O%27mahoney Family History
O%27mahoney Name Meaning
Irish: Anglicized form of Gaelic Ó Mathghamhna ‘descendant of Mathghamhain’ (see Mahoney). There are two families of this name, in Cork and Ulster, but the Ulster family name was usually Anglicized as McMahon.
Source: Dictionary of American Family Names ©2013, Oxford University Press