| Name | Meaning | Gender | Origin |
|---|
| Pepper | Pepper | Female | English |
| Pip | Lover of horses | Unisex | Greek |
| Pipsqueak | | Unisex | Hebrew |
| Pixie | A fairy like creature. Playful and mischievous | Female | English |
| Poco | Little. | Unisex | English |
| Powder | Substance of fine particles. Light, dry snow. | Unisex | English |
| Princess | Royal son | Female | English |
| Puddles | | Unisex | Hebrew |
| Pumpkin | Large round fruit with orange skin | Unisex | English |
| Queenie | Female ruler | Female | English |
| Rags | | Unisex | Hebrew |
| Rascal | One that is playfully mischievous | Unisex | English |
| Riley | Rye clearing | Male | English |
| Rina | Pet form of names in -rina | Female | English |
| Rocky | Battle cry | Male | Germanic |
| Rosie | Rose | Female | Latin |
| Roxy | Star | Female | Persian |
| Sadie | Princess | Female | Hebrew |
| Sam | He is called god | Male | Hebrew |
| Sammy | His name is God | Unisex | Hebrew |
| Sandy | Defending men | Male | Greek |
| Sasha | Defending men | Unisex | Greek |
| Sassy | Lively and spirited | Unisex | English |
| Selby | A place where willows grow | Female | American English |
| Sheba | Daughter of an oath | Female | Hebrew |
| Shelby | A place where willows grow | Female | American English |
| Shorty | Of less than average size | Unisex | English |
| Simba | Lion | Female | Swahili |
| Simone | Listening | Female | Hebrew |
| Slim | Slender in proportion to height. | Unisex | English |