| Sabina | | sah-BEE-nah (Italian, Spanish, Polish) | Italian, Spanish, Portuguese, Romanian, Polish, Czech, Slovene, Russian, Croatian, Ancient Roman | |
| Samuil | | sah-moo-EEL (Russian) | Russian, Bulgarian | |
| Sanya (2) | | - | Russian | |
| Sasha | | - | Russian, Ukrainian, English, French | |
| Saveli | | - | Russian | |
| Saveliy | | - | Russian | |
| Savely | | - | Russian | |
| Savva | | - | Russian | |
| Selena | | - | Spanish, Russian, Greek Mythology (Latinized) | |
| Semen | | - | Ukrainian, Russian | |
| Semyon | | sye-MYON, see-MYON | Russian | |
| Serafim | | - | Russian, Romanian, Macedonian | |
| Serafima | | sye-rah-FEE-mah (Russian), see-rah-FEE-mah (Russian), se-rah-FEE-mah (Macedonian) | Russian, Macedonian | |
| Sergei | | syer-GYAY (Russian), seer-GYAY (Russian) | Russian, Bulgarian | |
| Sergej | | syer-GYAY (Russian), seer-GYAY (Russian) | Russian, Bulgarian | |