| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Sybella | si-BEL-ə | English (Rare) | ||
| Sybil | SIB-əl | English | ||
| Syd | SID | English | ||
| Sydne | SID-nee | English (Rare) | ||
| Sydney | SID-nee | English | ||
| Sydnie | SID-nee | English (Modern) | ||
| Sylvanus | - | English (Archaic) | ||
| Sylvester | sil-VES-tər (English) | English, Dutch, Danish, German | ||
| Sylvia | SIL-vee-ə (English), SUYL-vee-ah (Finnish) | English, Swedish, Norwegian, Danish, Finnish, German | ||
| Symphony | SIM-fə-nee | English (Rare) |