Family History and Genealogy Resources by Surname
O'Malley Surname Origin
The descendant of Malley; Mala, Gaelic, the brow of a hill; Maille, smooth, placid, gentle.
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'Malley Surname Meaning and Family Facts
There is more to O'Malley family history than the origin of your surname:
A O'Malley Family History Thought:
'The only thing new in the world is the history you don't know.' --Harry S. Truman