| Name | Meaning | Gender | Origin |
|---|
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |
| Opal | Australian gemstone of remarkable colours, usually red, blue or green | Female | Sanskrit |
| Orlando | Famous land
| Male | Italian |
| Orson | Little bear
| Male | Latin |
| Orville | Gold town.
| Male | |
| Oscar | God's spear.
| Male | English |
| Otis | Wealthy.
| Male | |
| Otto | Born eighth or wealthy
| Male | |
| Pablo | Little. Form of Paul.
| Male | Spanish |
| Pandora | talented one | Female | Greek |
| Peaches | Red, yellow skinned fleshy fruit | Female | English |
| Peaches | Red, yellow skinned fleshy fruit | Female | English |
| Pearl | Precious jewel. A hard, rounded gem, usually white in colour | Female | Latin |
| Penelope | Dream weaver
| Female | Greek |
| Percival | Hero of several Arthurian stories
| Male | |
| Phoebe | bright one | Female | Greek |
| Phoebe | bright one | Female | Greek |
| Pierre | A rock. Form of Peter.
| Male | |
| Piper | Piper
| Female | English |
| 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 |
| Priscilla | Of ancient lineage | Female | Latin |
| Prudence | caution | Female | |
| Prue | Prudent, Cautious | Unisex | English |