| Name | Meaning | Gender | Origin |
|---|
| Oswald | Uncertain, possibly divine power | Male | German |
| Othello | Wealth | Male | German |
| Pal | A friend, buddy, chum. | Unisex | English |
| Patience | Patience | Female | English |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | English |
| Pearl | Pearl | Female | English |
| Pegasus | Myth Name (Winged Horse) | Unisex | English |
| Penny | Weaver | Female | Greek |
| Percy | Pierce valley | Male | French |
| Pickles | Food flavored in a solution of vinegar | Unisex | English |
| Pip | Lover of horses | Unisex | Greek |
| Pipsqueak | | Unisex | Hebrew |
| Pixie | A fairy like creature. Playful and mischievous | Female | English |
| Poco | Little. | Unisex | English |
| Pogo | | Unisex | Hebrew |
| Pookie | | Unisex | Hebrew |
| Primo | First | Male | Latin |
| Princess | Royal son | Female | English |
| Puddles | | Unisex | Hebrew |
| Pumpkin | Large round fruit with orange skin | Unisex | English |
| Radar | | Unisex | Hebrew |
| Rajah | Anticipation | Unisex | Arabic |
| Ramses | Son of Ra | Male | Ancient Egyptian |
| Ranger | Gamekeeper | Male | English |
| Rascal | One that is playfully mischievous | Unisex | English |
| Reggie | Ruler with counsel | Unisex | Germanic |
| Riley | Rye clearing | Male | English |
| Rina | Pet form of names in -rina | Female | English |
| Ringo | Apple, peace be with you | Male | English |
| Rocco | Battle cry | Male | Germanic |