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Keegan Family HistoryThis interesting surname is of Irish origin, and is an Anglicized form of the Old Gaelic "MacAodhagain". The Gaelic prefix "mac" denotes "son of", and the personal name "Aodhagain" is a diminutive of "Aodh", "fire", originally the name of a pagan god. The great MacAodhagain sept originated in the ancient territory of Ui Maine (comprising mid-Galway and south Roscommon), where they held the hereditary office of "ollav" or awyer to the ruling families. A branch of this important Brehon (law-giving) family settled in the Leinster counties of Wicklow and Dublin, where the name was Anglicized Keegan, the original Anglicized form being Egan...
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