Family History and Genealogy Resources by Surname
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.
O'Hara Surname Meaning and Family Facts
There is more to O'Hara family history than the origin of your surname:
A O'Hara Family History Thought:
'If you would not be forgotten,
As soon as you are dead and rotten,
Either write things worthy of reading,
Or do things worthy of writing.' --Benjamin Franklin, May 1738