| Prosperus | | - | Late Roman | |
| Prudentia | | - | Late Roman | |
| Prudentius | | - | Late Roman | |
| Quirina | | - | Late Roman | |
| Quirinus | | kwi-RIEN-əs (English), kwi-REEN-əs (English) | Roman Mythology, Late Roman | |
| Regula | | - | German (Swiss), Late Roman | |
| Remigius | | - | Late Roman | |
| Renata | | re-NAH-tah (Italian, Spanish, German, Polish) | Italian, Spanish, Portuguese, German, Polish, Czech, Croatian, Slovene, Late Roman | |
| Renatus | | - | Late Roman | |
| Romaeus | | - | Late Roman | |
| Romana | | - | Italian, Polish, Slovene, Croatian, Czech, Slovak, Late Roman | |
| Romanus | | - | Late Roman | |
| Rosalia | | ro-zah-LEE-ah (Italian) | Italian, Spanish, Portuguese, Late Roman | |
| Sabellius | | - | Late Roman | |
| Salvator | | - | Late Roman | |