| Slavomir | | - | Croatian, Serbian, Medieval Slavic | |
| Slobodan | | - | Serbian, Macedonian, Croatian | |
| Slobodanka | | - | Serbian, Croatian | |
| Smiljana | | - | Croatian, Serbian | |
| SnjeŽAna | | - | Croatian, Serbian | |
| Sofija | | - | Serbian, Croatian, Macedonian, Lithuanian, Latvian | |
| Sonja | | ZAWN-yah (German), SON-yah (Finnish) | German, Dutch, Swedish, Norwegian, Danish, Icelandic, Finnish, Slovene, Serbian, Croatian, Macedonia | |
| Spiridon | | - | Greek, Serbian, Croatian | |
| Spomenka | | - | Croatian | |
| SreĆKo | | - | Croatian, Serbian | |
| StaŠA | | - | Serbian, Slovene, Croatian | |
| Stana | | - | Czech, Serbian, Croatian | |
| Stanislav | | stah-nee-SLAHF (Russian) | Czech, Slovak, Russian, Ukrainian, Bulgarian, Slovene, Serbian, Croatian, Medieval Slavic | |
| Stanislava | | stah-nee-SLAH-vah (Russian) | Czech, Slovak, Bulgarian, Serbian, Croatian, Slovene, Russian, Medieval Slavic | |
| Stanka | | - | Slovene, Croatian, Bulgarian | |