| Name | Meaning | Gender | Origin |
|---|
| 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 |
| Owen | Well born, yew born | Male | Gaelic |
| Paige | Page | Female | English |
| Pax | Peace | Unisex | Latin |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | English |
| Pearl | Pearl | Female | English |
| Pebbles | After the character in 'The Flintstones' cartoons | Female | English |
| Penelope | Weaver | Female | Greek |
| Penny | Weaver | Female | Greek |
| Pepe | He will enlarge | Unisex | Hebrew |
| Pepper | Pepper | Female | English |
| Pepsi | Brand of cola soft drink. | Unisex | English |
| Percy | Pierce valley | Male | French |
| Phoebe | Bright | Female | Greek |
| Phoenix | Phoenix | Male | Greek |
| Pickles | Food flavored in a solution of vinegar | Unisex | English |
| Pip | Lover of horses | Unisex | Greek |
| Pirate | | Unisex | Hebrew |
| Pluto | Wealth, riches | Unisex | Greek |
| Polo | Brave wanderer | Male | English |
| Precious | Loved | Female | English |
| Preston | Priest settlement | Male | English |
| Prince | Royal son | Male | English |
| Princess | Royal son | Female | English |
| Puddles | | Unisex | Hebrew |
| Pumpkin | Large round fruit with orange skin | Unisex | English |