| Name | Meaning | Gender | Origin |
|---|
| Olive | kind one; olive tree, peace. Symbol of peace. A small oval fruit. | Female | English |
| Orange | Round citrus fruit originating in Southeast Asia. | Female | Fruit |
| Orange | Round citrus fruit originating in Southeast Asia. | Female | Fruit |
| Orleans | after the city | Unisex | |
| Osceola | | Unisex | Hebrew |
| Otto | Born eighth or wealthy
| Male | |
| Ovid | Sheep | Unisex | Roman |
| Oxford | From the ox ford
| Male | English |
| Palermo | | Male | Hebrew |
| Panama | | Female | Hebrew |
| Paris | Brand of perfume. | Female | |
| Parma | | Unisex | |
| Pearl | Precious jewel. A hard, rounded gem, usually white in colour | Female | Latin |
| Pembroke | bluff, headland | Male | English |
| Perry | French form of Peter
| Male | English |
| Persia | | Male | Hebrew |
| Perth | From the thorn bush or thicket
| Male | Scottish |
| Philadelphia | brotherly love | Male | Greek |
| Phoenix | Mystical Bird, Purple
| Male | Greek |
| Phoenix | Mystical Bird, Purple
| Male | Greek |
| Pike | pike, a fish | Male | |
| Pitcher | | Unisex | |
| Plymouth | | Unisex | Hebrew |
| Porter | gatekeeper, carrier | Male | Latin |
| Potter | maker of drinking and storage vessels | Male | English |