| Sanjica | | SAHN-yee-tsah | Croatian | |
| Sanjin | | - | Croatian | |
| Sebastijan | | - | Slovene, Croatian | |
| Senka | | - | Serbian, Croatian | |
| Severina | | - | Italian, Portuguese, Croatian, German, Ancient Roman | |
| Silvija | | - | Croatian, Slovene | |
| Silvijo | | - | Croatian | |
| Silvio | | SEEL-vyo (Italian), SEEL-byo (Spanish) | Italian, Spanish, Portuguese, Croatian | |
| SiniŠA | | - | Croatian, Serbian | |
| SlaĐAna | | SLAH-jah-nah | Serbian, Croatian | |
| Slava | | - | Russian, Slovene, Croatian | |
| Slaven | | - | Croatian, Serbian | |
| Slavica | | - | Serbian, Croatian, Slovene, Macedonian | |
| Slavka | | - | Slovene, Croatian | |
| Slavko | | - | Croatian, Serbian, Slovene | |