| Name | Meaning | Gender | Origin |
|---|
| Nipper | A small boy | Unisex | English |
| Nugget | As in Chicken | Unisex | English |
| Oberon | Noble bear | Unisex | German |
| Odie | Woad hill | Unisex | English |
| Oliver | Elf army | Male | French |
| Ollie | Elf army | Male | French |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Unisex | English |
| Orion | Son Of Fire | Male | Greek |
| Oscar | Divine spear | Male | English |
| Osiris | Uncertain, perhaps throne of the eye | Unisex | Ancient Egyptian |
| Otis | One who hears well | Male | Greek |
| Otto | Wealth | Male | German |
| Owen | Well born, yew born | Male | Gaelic |
| Pascal | Relating to Easter | Male | Latin |
| Paws | | Unisex | Hebrew |
| Paxton | Settlement of Poecc | Male | English |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | English |
| Pepsi | Brand of cola soft drink. | Unisex | English |
| Petal | A section of a flower | Unisex | English |
| Pickle | | Unisex | Hebrew |
| Pickles | Food flavored in a solution of vinegar | Unisex | English |
| Pico | | Unisex | Hebrew |
| Pip | Lover of horses | Unisex | Greek |
| Pipsqueak | | Unisex | Hebrew |
| Pj | | Unisex | Hebrew |
| Poco | Little. | Unisex | English |
| Porthos | | Unisex | Hebrew |
| Puddles | | Unisex | Hebrew |
| Puma | | Unisex | Hebrew |
| Pumpkin | Large round fruit with orange skin | Unisex | English |