Killoran (Irish: Mac Giolla Luaighrinn) is a surname of Irish origin meaning son of a devotee of (Saint) Luaighreann. Spelling variations include; Mac Killoran, Gilloran, Gilleran, O'Giollarain. It could also come from the toponymic Cill Luaighrinn, in this case meaning church of Luaighrinn.
People with this surname
References
Killoran Wikipedia(Text) CC BY-SA