| Name | Meaning | Gender | Origin |
|---|
| Norman | Thor mind, Thor courage | Male | Gaelic |
| Norris | Northener | Unisex | French |
| Obie | O.B. | Unisex | English |
| Odie | Woad hill | Unisex | English |
| Oliver | Elf army | Male | French |
| Oona | One | Female | Latin |
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Unisex | English |
| Orville | Gold town | Male | French |
| Oscar | Divine spear | Male | English |
| Otis | One who hears well | Male | Greek |
| Paco | From France | Male | Latin |
| Padfoot | | Unisex | Hebrew |
| Paige | Page | Female | English |
| Pauline | Small | Female | Latin |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | English |
| Peewee | | Unisex | Hebrew |
| Penny | Weaver | Female | Greek |
| Pepper | Pepper | Female | English |
| Petunia | Type of flower | Female | English |
| Pickles | Food flavored in a solution of vinegar | Unisex | English |
| Pip | Lover of horses | Unisex | Greek |
| Pipsqueak | | Unisex | Hebrew |
| Pixie | A fairy like creature. Playful and mischievous | Female | English |
| Poco | Little. | Unisex | English |
| Popcorn | Corn that when heated forms white edible puffs. | Unisex | English |
| Poppy | Poppy flower | Female | English |
| Precious | Loved | Female | English |
| Pretzel | Glazed, salted and brittle biscuit in the form of a knot or stick. | Unisex | English |
| Princess | Royal son | Female | English |
| Prongs | | Unisex | Hebrew |