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O'MAHONEY Family HistoryThis is an anglicized form of the Olde Gaelic name Mac Mathghamhna. The Gaelic prefix "mac" means "son (of)" plus the personal nickname Mathghamhan, a bear. Mathghamhan was the son of Cian Mac Mael Muda, a 10th Century prince and his wife, Sadbh, who was the High King, Brian Boru's daughter. In modern Gaelic the name is written as O'Mahuna and anglicized as (O) Mahony and (O) Mahoney. The sept belonged almost exclusively to south west Munster where they built fourteen fortified castles incuding one at Rosbrin in Co.
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