| Name | Meaning | Gender | Origin |
|---|
| Oreo | American cookie brand consisting of two chocolate wafers with white cream filling. | Male | |
| Oscar | God's spear.
| Male | English |
| Oskar | English, God's spear, Irish, deer-lover or champion warrior | Male | |
| Otis | Wealthy.
| Male | |
| Ozzy | From Osbert - Divinely bright warrior. | Male | |
| Pablo | Little. Form of Paul.
| Male | Spanish |
| Pako | | Unisex | Hebrew |
| Pea | | Unisex | Hebrew |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | |
| Peanutbutter | | Unisex | Hebrew |
| Peewee | | Unisex | |
| Penelope | Dream weaver
| Female | Greek |
| Phoebe | bright one | Female | Greek |
| Phoebe | bright one | Female | Greek |
| Pookah | | Unisex | Hebrew |
| Prudence | caution | Female | |
| Pumpkin | Large round fruit with orange skin | Male | |
| Quincy | Fifth: derived from Roman clan name.
| Male | |
| Rain | | Male | |
| Rainbow | | Female | |
| Rogan | redhead | Male | Irish |
| Rowdy | A rough disorderly person. | Male | American |
| Roxy | From Roxanne - Brilliant dawn | Female | English |
| Ruby | Jewel
| Female | Latin |
| Sabrina | Legendary princess
| Female | Celtic |