| Name | Meaning | Gender | Origin |
|---|
| Otis | Wealthy.
| Male | |
| Otto | Born eighth or wealthy
| Male | |
| Outlaw | A rebel or fugitive from the law. | Unisex | |
| Owen | Young fighter
| Male | Welsh |
| Ozzie | Strong
| Male | Short |
| Pacific | tranquil | Male | |
| Panda | A bear like Chinese mammal, with distinct black and white markings | Male | |
| Panther | A black leopard | Male | |
| Panthor | | Unisex | |
| Paprika | Spicy powder made from sweet red peppers. | Unisex | |
| Passion | Powerful emotions, boundless enthusiasm. | Unisex | |
| Patches | | Male | |
| Pavarotti | | Unisex | |
| Paws | | Male | |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | |
| Pebbles | after the character in 'The Flintstones' cartoons | Male | |
| Penguin | | Male | |
| Pepe | Spanish variation of Joseph | Male | Spanish |
| Pepper | A spice or condiment. | Male | Sanskrit |
| Percy | | Male | |
| Perry | French form of Peter
| Male | English |
| Persia | | Male | Hebrew |
| Pete | A rock. Form of Peter.
| Male | English |
| Phantom | Something elusive. A ghost | Unisex | |
| Phil | | Unisex | |