| Oatcake Obelix Oberon Obi-wan Obiana Ocásek Octavia Octavian Odan Odd Odeta Odie Odin Odink Odysseus Odyssey Offel Ogar Ogies Ogis Ogopogo Okie Oklahoma Okoun Okra | Olaf Old Chum Old Deuteronomy Old Mike Oleg Olga Olina Olive Oliver Olivie Olivier Olli Ollie Olymp Omar Omega Omega Onassis Onomatopoeia Onyx Ooga-Booga Oops Opal Ophelia Opie | Oprah Opus Orbit Orbitka Orča Ořech Oreo Orin Orina Orion Oříšek Orlon Orly Ornella Oromis Oron Orphan Orpheus Ort Orville Oscar Osiris Oskar Osman Oswald | Othello Otis Oto Ottaline Otter Otto Oudý Ouija Ouško Outlaw Outrigger Ouzo Ovie Owen Oxford Ozone Ozu Ozzie Ozzy O´malley |