| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Sidney | SID-nee | English | ||
| Sidonie | - | French | ||
| Sidony | - | English (Archaic) | ||
| Siena | see-EN-ə | English (Modern) | ||
| Sienna | see-EN-ə | English (Modern) | ||
| Sierra | see-ER-ə | English (Modern) | ||
| Sigdag | - | Ancient Germanic | ||
| SigfrØ&Eth;R | - | Ancient Scandinavian | ||
| Sigibert | - | Ancient Germanic | ||
| Sigifrid | - | Ancient Germanic | ||
| Sigihard | - | Ancient Germanic | ||
| Sigiheri | - | Ancient Germanic | ||
| Sigihild | - | Ancient Germanic | ||
| Sigilind | - | Ancient Germanic | ||
| Sigimund | - | Ancient Germanic |