| Name | Meaning | Gender | Origin |
|---|
| Olive | Olive | Female | English |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Unisex | English |
| Orion | Son Of Fire | Male | Greek |
| Pablo | Small | Male | Latin |
| Paige | Page | Female | English |
| Patience | Patience | Female | English |
| Paula | Small | Female | Latin |
| Paulina | Small | Female | Latin |
| Payton | Settlement of PÅ“ga | Male | English |
| Peaches | Red, yellow skinned fleshy fruit | Unisex | English |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | English |
| Pearl | Pearl | Female | English |
| Pebbles | After the character in 'The Flintstones' cartoons | Female | English |
| Peewee | | Unisex | Hebrew |
| Peggy | Pearl | Female | Greek |
| Penny | Weaver | Female | Greek |
| Peppy | | Unisex | Hebrew |
| Perri | Foreigner, stranger | Female | Latin |
| Philippa | Lover of horses | Female | Greek |
| Phoebe | Bright | Female | Greek |
| Picasso | | Unisex | Hebrew |
| Pickles | Food flavored in a solution of vinegar | Unisex | English |
| Pico | | Unisex | Hebrew |
| Pierre | Stone | Male | Greek |
| Piglet | | Unisex | Hebrew |
| Pilar | Pillar | Female | Spanish |
| Pinky | For Pinky Lee, the painting, and the color of her nose | Unisex | English |
| Pip | Lover of horses | Unisex | Greek |
| Piper | A pipe player | Female | English |
| Pippa | Lover of horses | Female | Greek |