| Name | Meaning | Gender | Origin |
|---|
| Othelo | | Unisex | |
| Otis | Wealthy.
| Male | |
| Otto | Born eighth or wealthy
| Male | |
| Oz | strength | Male | Hebrew |
| Pablo | Little. Form of Paul.
| Male | Spanish |
| Pabst | | Unisex | Hebrew |
| Paco | Eagle
| Male | Spanish |
| Panda | A bear like Chinese mammal, with distinct black and white markings | Male | |
| Panther | A black leopard | Male | |
| Passion | Powerful emotions, boundless enthusiasm. | Unisex | |
| Patches | | Male | |
| Patrick | Patrician: noble. Romans society was divided into plebeians: (commoners) and patricians: (aristocrats). Saint Patrick - patron saint of Ireland.
| Male | Latin |
| Paws | | Male | |
| Peace | Peaceful
| Male | Word |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | |
| Pebbles | after the character in 'The Flintstones' cartoons | Male | |
| Pedro | A Rock | Male | Spanish |
| Pee Wee | | Unisex | |
| Peek | | Unisex | |
| Pepper | A spice or condiment. | Male | Sanskrit |
| Pepsi | Brand of cola soft drink. | Male | |
| Percy | | Male | |
| Pete | A rock. Form of Peter.
| Male | English |
| Phantom | Something elusive. A ghost | Unisex | |
| Pharoah | | Unisex | Hebrew |