| Sidney | - | French Name | Sifet | - | Muslim Name |
| Sigbjorn | - | Norse Name | Sigfinnur | - | Icelandic Name |
| Sigfús | - | Icelandic Name | Sigmar | - | Icelandic Name |
| Sigmund | - | German Name | Sigmundur | - | Icelandic Name |
| Sigtryggur | - | Icelandic Name | Sigurd | - | Norse Name |
| Sigurður | - | Icelandic Name | Sigurjón | - | Icelandic Name |
| Sigvard | - | Norse Name | Sihaam | - | Hindu Name |
| Sihon | - | Biblical Name | Sikandar | - | Muslim Name |
| Sike | - | American Name | Sikis | - | American Name |
| Siku | - | Eskimo Name | Sikupik | - | Eskimo Name |
| Sikyahonaw | - | American Name | Sikyatavo | - | American Name |
| Silah | - | Muslim Name | Silaq | - | Eskimo Name |
| Silaruk | - | Eskimo Name | Silas | - | Biblical Name |
| Sileas | - | Scottish Name | Silla | - | Eskimo Name |
| Sillaq | - | Eskimo Name | Silny | - | Czechoslovakian Name |
| Silvan | - | Swiss Name | Silvano | - | Portuguese Name |
| Silvanus | - | Biblical Name | Silver | - | United States Name |
| Silverio | - | Philippines Name | Silvestre | - | Portuguese Name |
| Silvio | - | Italian Name | Silviu | - | Romanian Name |
| Silvius | - | Romanian Name | Sim | - | Gaelic Name |
| Simak | - | Muslim Name |
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