| Name | Meaning | Gender | Origin |
|---|
| Oni | Japanese for 'demon' | Unisex | |
| Onyx | A gemstone with bands of different colours. | Male | |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Male | |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Male | |
| Orpheus | | Male | |
| Ozzy | From Osbert - Divinely bright warrior. | Male | |
| Panda | A bear like Chinese mammal, with distinct black and white markings | Male | |
| Panther | A black leopard | Male | |
| Pearl | Precious jewel. A hard, rounded gem, usually white in colour | Female | Latin |
| Penguin | | Male | |
| Pepper | A spice or condiment. | Male | Sanskrit |
| Pepsi | Brand of cola soft drink. | Male | |
| Persephone | The daughter of Demeter and Zeus who was abducted by Hades but rescued by her mother and thereafter spent six months of the year on earth and six months in the underworld.
| Female | Greek |
| Phantom | Something elusive. A ghost | Unisex | |
| Piewacket | | Unisex | |
| Pirate | | Unisex | |
| Poe | peacock | Male | |
| Poppy | Flower with four crumpled petals in red, orange or white colours | Female | Latin |
| Poppy | Flower with four crumpled petals in red, orange or white colours | Female | Latin |
| Puma | | Female | |
| Raisin | | Unisex | |
| Rasputin | | Male | Hebrew |
| Raven | Dark haired or wise
| Female | Word |
| Rebel | One that resists of defies authority | Male | Word |
| Rocket | To move swiftly and powerfully | Male | Word |