| Name | Meaning | Gender | Origin |
|---|
| Pal | A friend, buddy, chum. | Unisex | English |
| Peaches | Red, yellow skinned fleshy fruit | Unisex | English |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | English |
| Pip | Lover of horses | Unisex | Greek |
| Pipsqueak | | Unisex | Hebrew |
| Poco | Little. | Unisex | English |
| Pooka | | Unisex | Hebrew |
| Porkchop | | Unisex | Hebrew |
| Puddles | | Unisex | Hebrew |
| Pumpkin | Large round fruit with orange skin | Unisex | English |
| Quin | Fifth | Unisex | Latin |
| Radar | | Unisex | Hebrew |
| Rafferty | Wielder of prosperity | Unisex | Gaelic |
| Rambo | | Unisex | Hebrew |
| Rascal | One that is playfully mischievous | Unisex | English |
| Rebel | One that resists of defies authority | Unisex | English |
| Reno | Ruler with counsel | Unisex | Germanic |
| Rocket | To move swiftly and powerfully | Unisex | English |
| Rogue | | Unisex | Hebrew |
| Roman | Roman | Unisex | Latin |
| Romy | Sea dew | Unisex | Latin |
| Rusty | Rusty, full of rust | Unisex | American English |
| Sable | Sable (black) | Unisex | English |
| Sabre | | Unisex | Hebrew |
| Sage | Aromatic herb | Unisex | English |
| Sammy | His name is God | Unisex | Hebrew |
| Sasha | Defending men | Unisex | Greek |
| Sasquatch | Has extra toes and hence is a bigfoot | Unisex | English |
| Sassy | Lively and spirited | Unisex | English |
| Satan | The Devil and adversary of God | Unisex | English |