| Name | Meaning | Gender | Origin |
|---|
| Peanut | Edible nuts eaten raw or roasted. | Unisex | English |
| Pebbles | After the character in 'The Flintstones' cartoons | Female | English |
| Peekaboo | | Unisex | Hebrew |
| Penny | Weaver | Female | Greek |
| Petula | Impatient | Female | Latin |
| Phoebe | Bright | Female | Greek |
| Pickles | Food flavored in a solution of vinegar | Unisex | English |
| Pico | | Unisex | Hebrew |
| Pixel | | Unisex | Hebrew |
| Pixie | A fairy like creature. Playful and mischievous | Female | English |
| Poppy | Poppy flower | Female | English |
| Princess | Royal son | Female | English |
| Prozac | | Unisex | Hebrew |
| Radar | | Unisex | Hebrew |
| Rascal | One that is playfully mischievous | Unisex | English |
| Reese | Enthusiasm | Male | Welsh |
| Rex | King | Male | Latin |
| Riley | Rye clearing | Male | English |
| Ringo | Apple, peace be with you | Male | English |
| Rocco | Battle cry | Male | Germanic |
| Rolf | Famous wolf | Male | Germanic |
| Romeo | Pilgrim to Rome | Male | Italian |
| Rosie | Rose | Female | Latin |
| Rowdy | Boisterous. Western Nickname. | Unisex | English |
| Roxy | Star | Female | Persian |
| Roz | Weak, tender or soft horse | Female | Germanic |
| Ruby | Red | Female | Latin |
| Rudy | Famous wolf | Male | Germanic |
| Rupert | Bright fame | Male | English |
| Rusty | Rusty, full of rust | Unisex | American English |