| Roman | | rah-MAHN (Russian), RAW-mahn (Polish) | Russian, Polish, Czech, Slovak, Ukrainian, Slovene, Croatian, German | |
| Ruslan | | roo-SLAHN (Russian) | Russian, Tatar, Bashkir, Ukrainian, Belarusian, Kazakh, Kyrgyz, Uzbek, Azerbaijani, Ossetian, Cheche | |
| Ruslana | | - | Ukrainian | |
| Sasha | | - | Russian, Ukrainian, English, French | |
| Semen | | - | Ukrainian, Russian | |
| Serhiy | | - | Ukrainian | |
| Sofiya | | sah-FEE-yah (Russian) | Russian, Ukrainian, Bulgarian | |
| Spartak | | - | Russian, Ukrainian, Bulgarian, Albanian, Armenian, Georgian | |
| Stanislav | | stah-nee-SLAHF (Russian) | Czech, Slovak, Russian, Ukrainian, Bulgarian, Slovene, Serbian, Croatian, Medieval Slavic | |
| Svitlana | | - | Ukrainian | |
| Svyatoslav | | svyah-tah-SLAHF (Russian) | Russian, Ukrainian | |
| Symon | | - | Ukrainian (Rare) | |
| Tamara | | tah-MAH-rah (Russian, Spanish, Italian), tə-MAHR-ə (English), TAM-ə-rə (English) | Russian, Ukrainian, Czech, Slovak, Polish, Slovene, Croatian, Serbian, Macedonian, English, Dutch, S | |
| Taonga | | - | Southern African, Tumbuka | |
| Taras | | tah-RAHS (Russian) | Ukrainian, Russian | |