| Sidon | Man | Hebrew Names |
| Sidone | Woman | American Names |
| Sidonia | Woman | Latin Names |
| Sidonie | Woman | French Names |
| Sidra | Woman | Latin Names |
| Siegfried | Man | German - German Names |
| Sienna | Woman | Italian Names |
| Sierra | Woman | Spanish Names |
| Sigfried | Man | German Names |
| Sigmar | Man | Scandinavian Names |
| Sigmund | Man | German Names |
| Signa | Woman | Scandinavian Names |
| Signe | Woman | Scandinavian Names |
| Sigourney | Unisex | French Names |
| Sigrid | Woman | Scandinavian Names |
| Sigrun | Woman | Scandinavian Names |
| Sigurd | Man | Scandinavian Names |
| Sigwin | Man | German - Old High German Names |
| Sigyn | Woman | Scandinavian Names |
| Sijuwade | Man | African Names |