| Name | Meaning | Gender | Origin |
|---|
| Pickles | Food flavored in a solution of vinegar | Unisex | English |
| Pip | Lover of horses | Unisex | Greek |
| Pirate | | Unisex | Hebrew |
| Pixie | A fairy like creature. Playful and mischievous | Female | English |
| Popeye | | Unisex | Hebrew |
| Preston | Priest settlement | Male | English |
| Prince | Royal son | Male | English |
| Princess | Royal son | Female | English |
| Puddles | | Unisex | Hebrew |
| Pumpkin | Large round fruit with orange skin | Unisex | English |
| Queenie | Female ruler | Female | English |
| Quinton | Fifth | Male | Latin |
| Rags | | Unisex | Hebrew |
| Rascal | One that is playfully mischievous | Unisex | English |
| Rebel | One that resists of defies authority | Unisex | English |
| Reese | Enthusiasm | Male | Welsh |
| Rex | King | Male | Latin |
| Riley | Rye clearing | Male | English |
| Rocket | To move swiftly and powerfully | Unisex | English |
| Rocko | | Unisex | Hebrew |
| Rocky | Battle cry | Male | Germanic |
| Romeo | Pilgrim to Rome | Male | Italian |
| Rosalyn | Weak, tender or soft horse | Female | Germanic |
| Rosie | Rose | Female | Latin |
| Roxy | Star | Female | Persian |
| Roy | Red | Male | Gaelic |
| Ruby | Red | Female | Latin |
| Rudy | Famous wolf | Male | Germanic |
| Sadie | Princess | Female | Hebrew |
| Saffron | From the spice or the colour, yellow | Female | English |