Family History and Genealogy Resources by Surname
O'Mahony Surname Origin
The descendant of Mahon, which signifies a bear.
Source: An Etymological Dictionary of Family and Christian Names With an Essay on their Derivation and Import; Arthur, William, M.A.; New York, NY: Sheldon, Blake, Bleeker & CO., 1857.
O'Mahony Surname Meaning and Family Facts
O'Mahony Last Name Meaning
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There is more to O'Mahony family history than the origin of your surname:
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A O'Mahony Family History Thought:
There are only two lasting bequests we can give our children, One is roots; the other, wings. --Anonymous