| Name | Meaning | Gender | Origin |
|---|
| Oliver | The olive tree. The biblical olive tree symbolizes fruitfulness and beauty and dignity. Extending an olive branch signifies an offer of peace.
| Male | Latin |
| Olivier | From the olive tree
| Male | |
| Opus | | Male | Hebrew |
| Orlando | Famous land
| Male | Italian |
| Otis | Wealthy.
| Male | |
| Oxford | From the ox ford
| Male | English |
| Pablo | Little. Form of Paul.
| Male | Spanish |
| Pacific | tranquil | Male | |
| Paco | Eagle
| Male | Spanish |
| Palermo | | Male | Hebrew |
| Patrick | Patrician: noble. Romans society was divided into plebeians: (commoners) and patricians: (aristocrats). Saint Patrick - patron saint of Ireland.
| Male | Latin |
| Paxton | From the peaceful farm
| Male | Latin |
| Pebbles | after the character in 'The Flintstones' cartoons | Male | |
| Peewee | | Unisex | |
| Pepe | Spanish variation of Joseph | Male | Spanish |
| Petipoint | | Unisex | Hebrew |
| Phantom | Something elusive. A ghost | Unisex | |
| Pharoah | | Unisex | Hebrew |
| Pieter | a Dutch Friesian name | Male | |
| Pigeon | | Male | |
| Pinky | For Pinky Lee, the painting, and the color of her nose | Unisex | |
| Pixel | | Male | |
| Plaise | Strong
| Male | |
| Pom Pom | | Unisex | |
| Popeye | | Male | |