O'Malley |
O'Mally |
O'Neil |
O'Roy |
O-Ren Ishii (after the character in the Kill Bill movie) |
O.B. |
O.B. (Orange Boy |
O.C. (Ordinary Cat) |
O.C. (Other Cat) |
O.F.C. (Our First Cat) |
O.J. |
O.J. Simpson |
O.N.N.A.O. (Oh No, Not Another One) |
O.T.M. |
Oaf |
Oakes |
Oakichobi |
Oakii |
Oakley |
Oakley Lucifer Fila Nike Levi Reebok |
Oasis |
Oatcake |
Oatmeal |
Oats |
Obelix |
Oberon |
Oberon Casimir Badpaintjob |
Oberon The Wonder Gut (Lord of the Faery Cats) |
Oberon-Smiley |
Obi |
Obi Wan Kenobi |
Obie (O.B.) |
Obijuan |
Obo |
Obsidian |
Obsididan |
Obstinate |
Ocabar |
Occi |
Occupant |
Ocelot |
Oci Osborne |
Ocitar |
Octavia |
October |
Odan |
Odd |
Oddball |
Oddibe |
Oddly McStrange |
Odeipus |
Odessa |
Odette |
Odie |
Odile |
Odin (Viking mythology the allmighty god) |
Odo |
Odyssey |
Oedipus |
Ofel |
Ofelia |
Off! |
Off-License |
Often |
Og |
Ogden |
Ogies (Afrikaans for Little eyes) |
Ogopogo |
Oh Arrogant One |
Oh Captain My Captain |
Oh Oh |
Oh-lee |
Oi! |
Oingo |
Oink |
Okavango |
Okee |
Okesha |
Oki |
Okie |
Okinawa |
Oklahoma |
Okra |
Oksana |
Ol Yeller |
Ol' Buddy |
Ol' Sport |
Olaf |
Old D |
Old Deuteronomy |
Old Grandad |
Old School |
Old Sweetie |
Old Yeller |
Olde Scratch |
Oleg |
Oleo |
Olga |
Olhausen |
Olia |
Olimpia |
Olive |
Oliver |
Oliver Sebastian |
Oliver Stone |
Oliver Twister |
Olivette |
Olivia |
Olivia Pawdancer |
Olivia The Otter Cat |
Olivier Serpentine |
Olja |
Olla |
Ollendorff |
Olli |
Ollie |
Ollie Bollie Mc Follie |
Ollie North |
Ollie South |
Olliecat |
Oloff |
Olsen. |
Oly |
Olympia DuKatKis |
Olympician |
Olympus Mons (after the great volcano on the planet Mars) |
Omaha |
Omar |
Omar Khayyam |
Omar Sharif |
Omega |
Omelet |
Omen |
Ometecuhtli (Aztec mythology the god of duality) |
Omi |
Omiros (Greek for hostage) |
Omni |
Omniscious |
Omonoia |
Onassis |
Ondine |
One Nut |
One-eyed Jack |
One-Pat |
Oni (Japanese for 'demon') |
Oni Cheeto |
Onion |
Onions |
Only |
Onnee |
Onomatopoeia |
Onya |
Onyx |
Onyx O'Kitty |
Ooga-Booga |
Ooh-la-la |
Oona |
Ooopy Poopy |
Ooowwwrrraahh |
Oops |
Oosha |
Ootzsatootsie |
Oozie |
Opal |
Opaline |
Ophelia |
Opie |
Opium |
Oprah |
Oprah Anne |
Oprah Whiskers |
Optimistic |
Opus |
Orange |
Orange Blossom |
Orange Boy |
Orange Cat |
Orange Harvey |
Orange Juice |
Orange Kitty |
Orange Pekoe |
Orange Pico |
Orange Wishes |
OrangEndymion |
Oranges |
Orangie |
Orangina |
Orangy |
Orbit |
Orca |
Ord |
Ordinary |
Ore |
Oreao |
Oregano |
Oreo |
Oreo Bigfoot Thunderkitty |
Oreo Purrowitz |
Organa (named after Princess Leia Organa) |
Orion |
Oriondo |
Orla (Irish name meaning golden princess) |
Orlando |
Orleans (after the city) |
Orlon |
Orman |
Ornery |
Orphan |
Orphan Annie |
Orphelia |
Orpheus |
Orpheus And Euridice |
Orrin G. Cat |
Orsino |
Orson |
Orson Winslow |
Orville |
Orville And Wilbur |
Orvis |
Osborn |
Oscar |
Oscar Mayer |
Oscar Pisser |
Osceola |
Oscer |
Osgood |
Oshi |
Osirira |
Osiris |
Oslo |
Osman |
Oso |
Oswald |
Otari |
Othello |
Other |
Other Guy |
Otis |
Otter |
Otto |
Otto Octavius |
Oui |
Ouija |
Ouisa (oh-wee-sah) |
Our Gigi |
Outi |
Outlaw |
Outrigger |
Ouzo |
Oven Mitt |
Overboard |
Overdrive |
Ovid |
Ow! |
Owas-sa |
Owen |
Owl |
Ox |
Oxford |
Oxley |
Oy |
Oyen |
Oz |
Ozma (after the character in The Wizard of Oz) |
Ozone |
Ozu |
Ozymandius |
Ozzie |
Ozzy |
Ozzy Pawsburn |
