| Name | Meaning | Gender | Origin |
|---|
| Ollie | Latin, olive tree | Male | English |
| 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 |
| Opie | | Unisex | |
| Opus | | Male | Hebrew |
| Orange | Round citrus fruit originating in Southeast Asia. | Female | Fruit |
| Orange | Round citrus fruit originating in Southeast Asia. | Female | Fruit |
| Orla | Irish name meaning golden princess | Female | Irish |
| Orville | Gold town.
| Male | |
| Oscar | God's spear.
| Male | English |
| Otto | Born eighth or wealthy
| Male | |
| Owen | Young fighter
| Male | Welsh |
| Ozzy | From Osbert - Divinely bright warrior. | Male | |
| Pamela | honeyed | Female | English |
| Pancake | | Unisex | |
| Paprika | Spicy powder made from sweet red peppers. | Unisex | |
| Paris | Brand of perfume. | Female | |
| Peaches | Red, yellow skinned fleshy fruit | Female | English |
| Peaches | Red, yellow skinned fleshy fruit | Female | English |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | |
| Pearl | Precious jewel. A hard, rounded gem, usually white in colour | Female | Latin |
| Peggy | pearl | Female | English |
| Pekoe | after orange pekoe tea | Unisex | |
| Penny | Greek, weaver | Female | English |
| Pepsi | Brand of cola soft drink. | Male | |