O'Hara Surname Origin
(Origin Irish) The descendant of 'Hara,' Chaldee form of ara, a mountain. In Gaelic, arra signifies a pledge, treachery; arr, a stag, a hind; arradh, an armament; ara, plural of ar, slaughter, battle. Hara, Saxon, a hare.
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.
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