| Radovan | | - | Slovak, Czech, Serbian, Croatian, Medieval Slavic | |
| Rajko | | - | Croatian | |
| Ranka | | - | Croatian | |
| Ranko | | - | Serbian, Croatian | |
| Ratimir | | - | Croatian, Medieval Slavic | |
| Ratko | | - | Croatian, Serbian | |
| Renata | | re-NAH-tah (Italian, Spanish, German, Polish) | Italian, Spanish, Portuguese, German, Polish, Czech, Croatian, Slovene, Late Roman | |
| Renato | | re-NAH-to (Italian, Spanish) | Italian, Spanish, Portuguese, Croatian | |
| Roko | | - | Croatian | |
| Roman | | rah-MAHN (Russian), RAW-mahn (Polish) | Russian, Polish, Czech, Slovak, Ukrainian, Slovene, Croatian, German | |
| Romana | | - | Italian, Polish, Slovene, Croatian, Czech, Slovak, Late Roman | |
| Rozalija | | - | Lithuanian, Slovene, Croatian, Macedonian | |
| Rozika | | - | Croatian | |
| RuŽA | | ROO-zhah | Croatian, Serbian | |
| RuŽIca | | - | Croatian | |