The origin of the surname O'Connor is Connacht, Ireland.

The name derives from gaélico O Ocone Conchobhiair.

Some variations of this family name include: Connor, Conner, Conor, Connors, O'Connor, Conners, Conner, Conner, Connars, O'Conner, O'Conner, Conner, Connairs, Connaire, Connaires, Caunnor and others.