| Name | Meaning | Gender | Origin |
|---|
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Male | |
| Oscar | God's spear.
| Male | English |
| Otis | Wealthy.
| Male | |
| Patches | | Male | |
| Pea | | Unisex | Hebrew |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | |
| Pebbles | after the character in 'The Flintstones' cartoons | Male | |
| Penelope | Dream weaver
| Female | Greek |
| Penny | Greek, weaver | Female | English |
| Pepper | A spice or condiment. | Male | Sanskrit |
| Petoskey | | Unisex | Hebrew |
| Phoebe | bright one | Female | Greek |
| Phoebe | bright one | Female | Greek |
| Pillow | A cloth case stuffed with something soft to cushion the head during sleep. | Unisex | |
| Pixie | A fairy like creature. Playful and mischievous | Female | |
| Pixie | A fairy like creature. Playful and mischievous | Female | Swedish |
| Pocket | | Unisex | |
| Polly | Bitter
| Female | English |
| Polly | Bitter
| Female | English |
| Pouncer | catname in Struwwelpeter | Unisex | |
| Princess | Female member of a royal family | Female | Word |
| Pumpkin | Large round fruit with orange skin | Male | |
| Ramses | son of God | Male | Egyptian |
| Rapunzel | | Unisex | |
| Rasta | | Unisex | Hebrew |