| Name | Meaning | Gender | Origin |
|---|
| Pixie | A fairy like creature. Playful and mischievous | Female | English |
| Pocket | | Unisex | Hebrew |
| Poco | Little. | Unisex | English |
| Polly | Bitter | Female | Hebrew |
| Pookie | | Unisex | Hebrew |
| Popcorn | Corn that when heated forms white edible puffs. | Unisex | English |
| Poppy | Poppy flower | Female | English |
| Porky | | Unisex | Hebrew |
| Prince | Royal son | Male | English |
| Princess | Royal son | Female | English |
| Puddles | | Unisex | Hebrew |
| Puffin | | Unisex | Hebrew |
| Pumpkin | Large round fruit with orange skin | Unisex | English |
| Queenie | Female ruler | Female | English |
| Rascal | One that is playfully mischievous | Unisex | English |
| Reggie | Ruler with counsel | Unisex | Germanic |
| Rex | King | Male | Latin |
| Riley | Rye clearing | Male | English |
| Rina | Pet form of names in -rina | Female | English |
| Rocco | Battle cry | Male | Germanic |
| Rocko | | Unisex | Hebrew |
| Rocky | Battle cry | Male | Germanic |
| Romeo | Pilgrim to Rome | Male | Italian |
| Romy | Sea dew | Unisex | Latin |
| Ronald | Ruler with counsel | Male | Norse |
| Rosie | Rose | Female | Latin |
| Roxie | Star | Unisex | Persian |
| Roxy | Star | Female | Persian |
| Ruby | Red | Female | Latin |
| Rusty | Rusty, full of rust | Unisex | American English |