| Name | Meaning | Gender | Origin |
|---|
| Notebook | | Unisex | Hebrew |
| Nyx | Greek goddess of night | Female | Greek |
| Old Yeller | | Unisex | Hebrew |
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |
| Oshi | | Unisex | Hebrew |
| Owl | | Unisex | |
| Pallas | wisdom | Female | Greek |
| Pandora | talented one | Female | Greek |
| Panthro | | Unisex | Hebrew |
| Paris | Brand of perfume. | Female | |
| Paula | small | Female | Feminine |
| Pavlov | | Unisex | Hebrew |
| Pebble | | Unisex | |
| Pele | Hawaiian volcano goddess. | Female | Hawaiian |
| Pickles | Food flavored in a solution of vinegar | Unisex | |
| Pig | | Unisex | Hebrew |
| Ping | | Unisex | |
| Pippen | | Unisex | Hebrew |
| Pitty Pat | | Unisex | |
| Please | | Unisex | Hebrew |
| Pokemon | | Unisex | Hebrew |
| Poker | | Unisex | |
| Polaris | | Unisex | Hebrew |
| Pollyanna | Greek or Latin version of Hannah, Hebrew, grace | Female | Combination |