| Name | Meaning | Gender | Origin |
|---|
| Oster | | Unisex | |
| Othello | he has the sound of God | Male | Hebrew |
| Otis | Wealthy.
| Male | |
| Ouija | | Unisex | Hebrew |
| Outlaw | A rebel or fugitive from the law. | Unisex | |
| Ovid | Sheep | Unisex | Roman |
| Ox | | Unisex | Hebrew |
| Oz | strength | Male | Hebrew |
| Ozzie | Strong
| Male | Short |
| Ozzy | From Osbert - Divinely bright warrior. | Male | |
| Pacino | | Male | |
| Padgett | Attendant
| Male | |
| Paget | Attendant
| Male | |
| Pagoda | | Unisex | Hebrew |
| Palmer | palm bearing pilgrim | Male | English |
| Panache | | Unisex | Hebrew |
| Pancho | Nickname for Francisco and Frank.
| Male | Spanish |
| Panda | A bear like Chinese mammal, with distinct black and white markings | Male | |
| Panther | A black leopard | Male | |
| Panzer | | Unisex | Hebrew |
| Paprika | Spicy powder made from sweet red peppers. | Unisex | |
| Paradise | | Unisex | |
| Paragon | | Unisex | Hebrew |
| Parker | cultivated land | Male | English |
| Parsley | Herb used for seasoning or as a garnish. | Unisex | |