| Pomponius | | - | Ancient Roman | |
| Pontius | | PAHN-shəs (English), PAHN-tee-əs (English) | Ancient Roman, Biblical Latin, Biblical | |
| Porcia | | - | Ancient Roman | |
| Porcius | | - | Ancient Roman | |
| Primitiva | | pree-mee-TEE-vah (Spanish) | Spanish, Late Roman | |
| Primitivus | | - | Late Roman | |
| Primus | | - | Late Roman | |
| Prisca | | PRIS-kə (English) | Biblical, Dutch, Ancient Roman, Biblical Latin | |
| Priscilla | | pri-SIL-ə (English), pree-SHEEL-lah (Italian) | English, French, Italian, Ancient Roman, Biblical Latin, Biblical | |
| Priscus | | - | Ancient Roman | |
| Proserpina | | - | Roman Mythology | |
| Proserpine | | - | Roman Mythology | |
| Prosperus | | - | Late Roman | |
| Prudentia | | - | Late Roman | |
| Prudentius | | - | Late Roman | |