| Name | Meaning | Gender | Origin |
|---|
| 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 | |
| Oscar | God's spear.
| Male | English |
| Otis | Wealthy.
| Male | |
| Otto | Born eighth or wealthy
| Male | |
| Owen | Young fighter
| Male | Welsh |
| Paisano | | Unisex | |
| Pandora | talented one | Female | Greek |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | |
| Pebbles | after the character in 'The Flintstones' cartoons | Male | |
| Penny | Greek, weaver | Female | English |
| Pepper | A spice or condiment. | Male | Sanskrit |
| Pepsi | Brand of cola soft drink. | Male | |
| Phoebe | bright one | Female | Greek |
| Phoebe | bright one | Female | Greek |
| Piper | Piper
| Female | English |
| Pippa | lover of horses | Female | English |
| Pixie | A fairy like creature. Playful and mischievous | Female | |
| Pixie | A fairy like creature. Playful and mischievous | Female | Swedish |
| Poppy | Flower with four crumpled petals in red, orange or white colours | Female | Latin |
| Poppy | Flower with four crumpled petals in red, orange or white colours | Female | Latin |
| Prince | Principal one: first. The rock musician Prince.
| Male | Latin |
| Princess | Female member of a royal family | Female | Word |
| Priscilla | Of ancient lineage | Female | Latin |
| Rebel | One that resists of defies authority | Male | Word |