| Name | Meaning | Gender | Origin |
|---|
| Pluto | Wealth, riches | Unisex | Greek |
| Pocket | | Unisex | Hebrew |
| Pogo | | Unisex | Hebrew |
| Pokey | | Unisex | Hebrew |
| Pollyanna | Combination of Polly and Anna | Unisex | English |
| Puck | Elf | Unisex | English |
| Puma | | Unisex | Hebrew |
| Raisin | | Unisex | Hebrew |
| Ralphie | Wise Ruler, Wolf | Unisex | English |
| Rambler | | Unisex | Hebrew |
| Rambo | | Unisex | Hebrew |
| Rascal | One that is playfully mischievous | Unisex | English |
| Rasta | | Unisex | Hebrew |
| Rebel | One that resists of defies authority | Unisex | English |
| Rocket | To move swiftly and powerfully | Unisex | English |
| Rogue | | Unisex | Hebrew |
| Romy | Sea dew | Unisex | Latin |
| Rorschach | | Unisex | Hebrew |
| Roxey | | Unisex | Hebrew |
| Roxie | Star | Unisex | Persian |
| Rusty | Rusty, full of rust | Unisex | American English |
| Sable | Sable (black) | Unisex | English |
| Sabre | | Unisex | Hebrew |
| Salem | Secure, peace | Unisex | Arabic |
| Sammy | His name is God | Unisex | Hebrew |
| Sampson | Sun | Unisex | Hebrew |
| Sarge | Noncommissioned Army or Air Force rank | Unisex | English |
| Sasha | Defending men | Unisex | Greek |
| Sassy | Lively and spirited | Unisex | English |
| Satan | The Devil and adversary of God | Unisex | English |