| Name | Meaning | Gender | Origin |
|---|
| Nike | victory | Male | Greek |
| Nikko | Greek, people of victory | Male | English |
| Niko | victory of the people | Male | Greek |
| Nippy | | Unisex | Hebrew |
| Nugget | as in Chicken | Unisex | |
| Oink | | Unisex | Hebrew |
| Onyx | A gemstone with bands of different colours. | Male | |
| 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 |
| Orion | Son of Fire
| Male | Greek |
| Oscar | God's spear.
| Male | English |
| Osiris | with strong eyesight | Male | Egyptian |
| Outlaw | A rebel or fugitive from the law. | Unisex | |
| Pansy | thought | Female | English |
| Panther | A black leopard | Male | |
| Papyrus | | Unisex | |
| Paris | Brand of perfume. | Female | |
| Paris Hilton | | Unisex | |
| Paws | | Male | |
| Pazzo | | Unisex | Hebrew |
| Peace | Peaceful
| Male | Word |
| Peaches | Red, yellow skinned fleshy fruit | Female | English |
| Peaches | Red, yellow skinned fleshy fruit | Female | English |
| Pebbles | after the character in 'The Flintstones' cartoons | Male | |
| Pepper | A spice or condiment. | Male | Sanskrit |