| Name | Meaning | Gender | Origin |
|---|
| Possum | Nocturnal marsupial with a thick coat of hair, long nose and long tail | Male | |
| Precious | One who is beloved, a darling. | Female | Latin |
| Prince | Principal one: first. The rock musician Prince.
| Male | Latin |
| Princess | Female member of a royal family | Female | Word |
| Pumpkin | Large round fruit with orange skin | Male | |
| Puss | | Male | |
| Puss Puss | | Unisex | |
| Pussy | | Unisex | |
| Ralph | Red wolf
| Male | English |
| Ralph | Red wolf
| Male | English |
| Rambo | | Male | |
| Rebel | One that resists of defies authority | Male | Word |
| Rex | after the Rex Banner character in The Simpsons cartoons | Male | Latin |
| Riley | courageous | Female | Irish |
| Ripper | | Unisex | |
| River | | Male | |
| Rocky | rest | Male | English |
| Romeo | pilgrim to Rome | Male | Italian |
| Roo | | Unisex | Hebrew |
| Rosie | From Rose - The most beautiful of flowers | Female | English |
| Roxie | Persian, dawn | Female | English |
| Roxy | From Roxanne - Brilliant dawn | Female | English |
| Ruby | Jewel
| Female | Latin |
| Rusty | Covered in rust - a brownish red colour. | Unisex | |
| Sally | saviour | Female | English |