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O cat names
| O'Brien | O'Connor | O'Hara |
| O'Keefe | O.J. | O.T.M. |
| Oak | Oakie | Oakland |
| Oakley | Oalo | Oasis |
| Oatcake | Oates | Oath |
| Oatie | Oatmeal | Oats |
| Oatsung | Oba | Obadiah |
| Obelia | Oberarth | Oberon |
| Oberrunon | Oberth | Obession |
| Obi | Oblong | Oboe |
| Ocean | Oceanus | Ocelot |
| Octagonal | Octavia | October |
| Ocyrrhoe | Odalis | Oddjob |
| Ode | Odeda | Odelette |
| Odelia | Odell | Odelyn |
| Odera | Oderic | Odessa |
| Odet | Odetta | Odi |
| Odie | Odin | Odinan |
| Odissan | Odo | Odyar |
| Odyssey | Odyssia | Odzanends |
| Oedipuss | Oeneus | Oenone |
| Oenopion | Oeta | Offbeat |
| Officer | Ofira | Ogden |
| Ogee | Ogin | Ogun Ogunkeye |
| Ogunsanwo | Ohio | Ohrbach |
| Oink | Okalani | Okaloosa |
| Okemo | Okie | Oko |
| Okon | Okra | Ol'Sport |
| Ola | Olaf | Olay |
| Ole | Oleander | Oleda |
| Olenko | Olery | Olesko |
| Olga | Olia | Oliff |
| Olin | Olina | Olinda |
| Olisa | Olive | Oliver |
| Olivia | Olka | Ollie |
| Olly | Olov | Olsen |
| Olwen | Olya | Olympia |
| Olympian | Olympus | Olyusha |
| Oma | Omaha | Omar |
| Ombudsman | Omega | Omelet |
| Omer | Omphale | Omusa |
| Ona | Onassis | Onawa |
| Once | Ondrei | Oneida |
| Onion | Onita | Ono |
| Onomatopoeia | Onyx | Oobie |
| Ooh | Oona | Oopla |
| Opal | Opaque | Opera |
| Operator | Opey | Ophelia |
| Ophion | Opie | Opium |
| Opossum | Oppenheimer | Oprah |
| Option | Opus | Oputrageous |
| Orah | Oral | Oralee |
| Oralia | Orange | Orangeade |
| Orangetta | Orangutan | Orantes |
| Orb | Orbis | Orbit |
| Orc | Orchid | Oread |
| Oregano | Orelle | Oren |
| Oreo | Organdy | Organic |
| Organza | Oriana | Oriel |
| Original | Orinda | Orino |
| Orinthia | Oriole | Orion |
| Orit | Orithyia | Orji |
| Orla | Orlando | Orlenda |
| Orlo | Orloff | Ormand |
| Ormandy | Ormazd | Ormerod |
| Ornament | Ornate | Ornek |
| Ornice | Ornit | Oroonoko |
| Orpha | Orpheus | Orphy |
| Orrin | Orris | Orsa |
| Orsel | Ortega | Orthodox Orval |
| Orville | Orvis | Orwell |
| Oryna | Orzo | Osbert |
| Osbon | Osborne | Oscar |
| Osen | Osgood | Osha |
| Oshkosh | Osiris | Oskar |
| Oslo | Osman | Osmond |
| Osmosis | Ossi | Ossian |
| Ossip | Osten | Ostentatious |
| Ostrich | Oswald | Oswin |
| Osyth | Otek | Othello |
| Othon | Otik | Otilio |
| Otis | Ottah | Otto |
| Ottomar | Ottone | Ouida |
| Ouija | Ounce | Outdo |
| Outie | Outlaw | Outlet |
| Outrigger | Outsider | Outtake |
| Owain | Owen | Owena |
| Owl | Owner | Ox |
| Oxford | Oya | Oyster |
| Oz | Ozanna | Ozawa |
| Ozer | Ozone | Ozzie |