The Irish surname Keegan is of patronymic origin. The name is derived from the Gaelic name Mac Aodhagáin meaning son of, or descendat of Aodhagáin, an Irish personal name meaning " fire ". In the East of Ireland the Keegan name is predominantly found in counties Dublin and Wexford. There are also branches on the West of Ireland mainly in counties Mayo and Roscommon. Today there are approximately 9,600 bearers of the surname Keegan living in The United States.
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