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Коты
| Oaf | Oak | Oakes | Oases | Oasis | Oatmeal |
| Oats | Obelix | Oberon | Oberon-Smiley | Obi | Obie |
| Obijuan | Obiwankenobe | Obo | Obsidian | Obsididan | Obstinate |
| Ocabar | Occupant | Ocean | Ocelot | Oci | Ocitar |
| Octavius | October | Odan | Odd | Oddball | Oddibe |
| Oddly | Odeipus | Odessey | Odie | Odile | Odin |
| Odo | Odysseus | Odyssey | Oedipus | Ofel | Off-License |
| Often | Ogden | Ogies | Ogre | Ogopogo | Oh |
| Oingo | Oink | Okavango | Oki | Ol | Olaf |
| Old | Olde | Oldsmobile | Oleg | Oleo | Olhausen |
| Olive | Oliver | Olivier | Ollendorff | Oloff | Olsen |
| Olympician | Olympus | Omar | Omega | Omen | Ometecuhtli |
| Omiros | Omni | Omniscious | Onassis | Ondine | One |
| One-eyed | One-Pat | Oni | Onion | Onions | Onnee |
| Onyx | Ooch | Oogie | Ooopy | Ooowwwrrraahh | Oops |
| Ootzsatootsie | Oozie | Opal | Opie | Opium | Oprah |
| Optimistic | Opus | Orange | OrangEndymion | Oranges | Orangy |
| Orbit | Ord | Oreao | Oregano | Oreo | Orion |
| Oriondo | Orlando | Orleans | Orlon | Orman | Ormando |
| Ornery | Orphan | Orpheus | Orrin | Orsino | Orson |
| Orvis | Oryan | Osborn | Osborne | Oscar | Oscer |
| Osgood | Oshi | Osiris | Oslo | Osman | Oso |
| Oswald | Othello | Other | Otis | Otter | Otto |
| Our | Outi | Outlaw | Outrigger | Ouzo | Oven |
| Overboard | Overdrive | Overtime | Ovid | Owas-sa | Owen |
| Owl | Ox | Oxford | Oxley | Oy | Oyen |
| Oz | Ozone | Ozu | Ozymandius | Ozzie | Ozzy |
Кошки
| Oakichobi | Oakii | Oakley | Oasis | Oatcake | Oblitera |
| Occi | Oce | Octavia | Odessa | Odette | Ofelia |
| Oh-lee | Okee | Okesha | Okie | Okinawa | Oklahoma |
| Okra | Oksana | Olga | Olia | Olimpia | Olivette |
| Olivia | Olja | Olla | Olli | Ollie | Olliecat |
| Olly | Oly | Olympia | Omaha | Omega | Omelet |
| Omi | Omiley | Omni | Omonoia | One | Only |
| Onomatopoeia | Onya | Ooga-Booga | Ooh-la-la | Oona | Oosha |
| Opaline | Ophelia | Orange | Orangie | Orangina | Orangy |
| Orca | Ordinary | Ore | Organa | Orla | Orlana |
| Orlanda | Orphelia | Orrianna | Orville | Osaline | Oscarlina |
| Osceola | Oshaline | Osirira | Otari | Oui | Ouija |
| Ouisa | Oully | Oury | Owl | Oxana | Ozma |