| Name | Meaning | Gender | Origin |
|---|
| Opal | Jewel, gem | Female | Sanskrit |
| Ophelia | Help | Female | Greek |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Unisex | English |
| Oscar | Divine spear | Male | English |
| Othello | Wealth | Male | German |
| Owen | Well born, yew born | Male | Gaelic |
| Paisley | Church, cemetery | Unisex | English |
| Panda | A bear like Chinese mammal, with distinct black and white markings | Unisex | English |
| Panther | A black leopard | Unisex | English |
| Patches | | Unisex | Hebrew |
| Paws | | Unisex | Hebrew |
| Payton | Settlement of PÅ“ga | Male | English |
| Peaches | Red, yellow skinned fleshy fruit | Unisex | English |
| 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 |
| Pepper | Pepper | Female | English |
| Phantom | Something elusive. A ghost | Unisex | English |
| Phoebe | Bright | Female | Greek |
| Pierre | Stone | Male | Greek |
| Piper | A pipe player | Female | English |
| Pixie | A fairy like creature. Playful and mischievous | Female | English |
| Plato | Liberal | Male | Greek |
| Pockets | | Unisex | Hebrew |
| Pogo | | Unisex | Hebrew |
| Poopsie | | Unisex | Hebrew |
| Popcorn | Corn that when heated forms white edible puffs. | Unisex | English |
| Portia | Pig | Female | Latin |
| Prancer | | Unisex | Hebrew |