| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Petronilla | - | Italian, Late Roman | ||
| Petronius | - | Ancient Roman | ||
| Petru | - | Romanian, Corsican, Old Church Slavic | ||
| Pia | PEE-ah (Italian, Danish, German) | Italian, Swedish, Norwegian, Danish, German, Polish, Slovene, Late Roman | ||
| Pius | PIE-əs (English) | Late Roman | ||
| Placida | - | Late Roman, Italian | ||
| Placidus | - | Late Roman | ||
| Plinius | - | Ancient Roman | ||
| Pluto | PLOO-to (English) | Greek Mythology (Latinized), Roman Mythology | ||
| Pollux | PAHL-uks (English) | Roman Mythology | ||
| Pomona | - | Roman Mythology | ||
| Pompeius | - | Ancient Roman | ||
| Pompiliu | - | Romanian | ||
| Pompilius | - | Ancient Roman | ||
| Pomponia | - | Ancient Roman |