| Siran | Woman | Armenian Names |
| Sire | Man | English Names |
| Siren | Woman | Greek Names |
| Sirena | Woman | Spanish Names |
| Siri | Woman | Scandinavian Names |
| Siriol | Woman | Welsh Names |
| Sirius | Man | Greek Names |
| Sirvat | Woman | Armenian Names |
| Sissela | Woman | Scandinavian Names |
| Sissy | Woman | American Names |
| Sitanka | Unisex | Native American - Sioux Names |
| Sitara | Woman | Indian Names |
| Sitembileq | Woman | African - Zimbabwe Names |
| Siusan | Woman | Irish Names |
| Siv | Woman | Scandinavian Names |
| Sivan | Unisex | Hebrew Names |
| Sixsipita | Unisex | Native American - Blackfoot Names |
| Sixten | Man | Scandinavian Names |
| Sixtine | Woman | French Names |
| Sixto | Man | Spanish Names |