| Name | Meaning | Gender | Origin |
|---|
| Oliver | The olive tree. The biblical olive tree symbolizes fruitfulness and beauty and dignity. Extending an olive branch signifies an offer of peace.
| Male | Latin |
| 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 | |
| Oxford | From the ox ford
| Male | English |
| Ozzy | From Osbert - Divinely bright warrior. | Male | |
| Padre | | Unisex | Hebrew |
| Panda | A bear like Chinese mammal, with distinct black and white markings | Male | |
| Panda Bear | | Unisex | |
| Patch | A pad or shield worn over one eye. | Male | |
| Patches | | Male | |
| Patty | patrician | Female | English |
| Pearl | Precious jewel. A hard, rounded gem, usually white in colour | Female | Latin |
| Penguin | | Male | |
| Pepe | Spanish variation of Joseph | Male | Spanish |
| Pepe El Pew | | Unisex | |
| Pepe Le Pew | | Unisex | |
| Pepper | A spice or condiment. | Male | Sanskrit |
| Peppermint Patty | | Unisex | |
| Peter | A rock. Peter the biblical fisherman and apostle had impulsive nature and rocklike faith. In Catholic tradition he is the first pope.
| Male | Greek |
| Petey | | Male | |
| Phantom | Something elusive. A ghost | Unisex | |
| Pie | A baked pastry filled with fruit or meat. | Unisex | |
| Pinstripe | | Unisex | |
| Pinto | | Unisex | |