| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Sieghild | - | German | ||
| Sieglinde | - | German, Germanic Mythology | ||
| Siegmund | ZEEK-muwnt | German | ||
| Siegward | - | German | ||
| Siemen | SEE-mən (Dutch) | Dutch, Frisian | ||
| Siemowit | - | Polish (Archaic) | ||
| Siet | SEET | Frisian | ||
| Sietse | SEET-sə | Frisian | ||
| Sif | SEEF (Norse Mythology) | Norse Mythology, Danish, Icelandic | ||
| Sigdag | - | Ancient Germanic | ||
| Sigeberht | - | Anglo-Saxon | ||
| Sigeweard | - | Anglo-Saxon | ||
| SigfrØ&Eth;R | - | Ancient Scandinavian | ||
| Sigfrid (2) | - | Norwegian | ||
| Sigfrido | seeg-FREE-do (Italian), seeg-FREE-dho (Spanish) | Italian, Spanish |