| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Sylvester | sil-VES-tər (English) | English, Dutch, Danish, German | ||
| Sylvi | SUYL-vee (Finnish) | Norwegian, Swedish, Finnish | ||
| Sylvia | SIL-vee-ə (English), SUYL-vee-ah (Finnish) | English, Swedish, Norwegian, Danish, Finnish, German | ||
| Symon | - | Ukrainian (Rare) | ||
| SynnØVe | - | Norwegian | ||
| Synne | - | Norwegian | ||
| Syntyche | SIN-tə-kee (English) | Biblical, Biblical Greek, Ancient Greek | ||
| Syuzanna | - | Russian | ||
| Szabina | SAW-bee-naw | Hungarian | ||
| Szabolcs | - | Hungarian | ||
| Szandra | - | Hungarian | ||
| SzilÁRd | - | Hungarian | ||
| Szilveszter | SEEL-ves-ter | Hungarian | ||
| Szilvia | SEEL-vee-aw | Hungarian | ||
| Szonja | SON-yaw | Hungarian |