| Signy | | - | Swedish, Norwegian, Danish | |
| SigrÍ&Eth;R | | - | Ancient Scandinavian | |
| SigrÚN | | - | Ancient Scandinavian, Norse Mythology, Icelandic | |
| Sigrid | | SEEG-reed (Finnish) | Norwegian, Swedish, Danish, Estonian, Finnish (Archaic) | |
| Sigrun | | - | Swedish, Norwegian, Danish | |
| Sigsteinn | | - | Ancient Scandinavian | |
| Sigur&Eth;R | | - | Ancient Scandinavian, Norse Mythology | |
| Sigur&Eth;Ur | | - | Icelandic | |
| Sigurd | | SEE-gurd (Swedish) | Norwegian, Danish, Swedish, Norse Mythology | |
| Siiri | | SEE:-ree (Finnish) | Estonian, Finnish | |
| Sikandar | | - | Urdu, Pashto | |
| Sikke | | SIK-kə | Frisian | |
| Silas | | SIE-ləs (English) | English, Greek, Biblical, Biblical Latin, Biblical Greek | |
| Silje | | - | Norwegian, Danish | |
| Silke | | ZIL-kə (German) | German, Dutch | |