| Name | Meaning | Gender | Origin |
|---|
| Pico | | Unisex | Hebrew |
| Pierre | A rock. Form of Peter.
| Male | |
| Pinky | For Pinky Lee, the painting, and the color of her nose | Unisex | |
| Pip | Small seed of a fruit. Also "Pipsqueak" one that is small | Male | English |
| Pippin | Name of a king
| Male | |
| Pipsqueak | | Unisex | Hebrew |
| Pixel | | Male | |
| Poco | Little. | Unisex | |
| Pompom | | Unisex | |
| Pookie | | Unisex | |
| Popcorn | Corn that when heated forms white edible puffs. | Unisex | |
| Prince | Principal one: first. The rock musician Prince.
| Male | Latin |
| Pudding | | Unisex | |
| Puddles | | Male | Hebrew |
| Pugsley | | Unisex | Hebrew |
| Pumpkin | Large round fruit with orange skin | Male | |
| Putt-Putt | | Unisex | Hebrew |
| Quasar | Meteorite | Unisex | Hindu |
| Quimby | from the woman's estate | Male | Norse |
| Rabbit | | Unisex | |
| Raisin | | Unisex | |
| Rascal | One that is playfully mischievous | Male | |
| Renny | little prosperous one | Male | Anglicized |
| Robin | Famed: bright: shining Form of Robert popular since the medieval days of Robin Hood. Robinson: (English) Son of Robert Famed: bright: shining. Surname.
| Male | |
| Rollo | wolf | Male | Latin |