| Name | Meaning | Gender | Origin |
|---|
| Orca | | Unisex | |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Male | |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Male | |
| Oscar | God's spear.
| Male | English |
| Oso | Bear. Oso for males and Osa for females. | Unisex | |
| Otis | Wealthy.
| Male | |
| Owen | Young fighter
| Male | Welsh |
| Ozzie | Strong
| Male | Short |
| Ozzy | From Osbert - Divinely bright warrior. | Male | |
| Pablo | Little. Form of Paul.
| Male | Spanish |
| Paisley | church, cemetery | Female | Scottish |
| Palmer | palm bearing pilgrim | Male | English |
| Panama | | Female | Hebrew |
| Pandora | talented one | Female | Greek |
| Panther | A black leopard | Male | |
| Paris | Brand of perfume. | Female | |
| Pascal | born at Easter | Male | |
| Patch | A pad or shield worn over one eye. | Male | |
| Patches | | Male | |
| Peaches | Red, yellow skinned fleshy fruit | Female | English |
| Peaches | Red, yellow skinned fleshy fruit | Female | English |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | |
| Pearl | Precious jewel. A hard, rounded gem, usually white in colour | Female | Latin |
| Pebbles | after the character in 'The Flintstones' cartoons | Male | |
| Peekaboo | | Male | |