Oates
O'Cullen
O'Daly
O'Dogherty
Odrowaz
Odwaga
Odyniec
O'Falvey
O'Flanagan
O'Flynn
Ogonczyk
O'Hagan
O'Heyne
Oksza
Olawa
O'Leary
O'Naughton
Orla
Orton
Orwell
Oskierka
Osmond
Osmund
Ossoria
Ostoja
Ostrogski
Oswald
Oszyk
Ouldsworth
Ousley
Ovedale
Owada
Owen
Owens
Oxford
Oxley