| Sisera | - | Biblical Name | Sisi | - | African Name |
| Sitabhan | - | Gaelic Name | Sitakanta | - | Indian Name |
| Sitakanta | - | Hindu Name | Sitanshu | - | Indian Name |
| Sitanshu | - | Hindu Name | Sitikantha | - | Indian Name |
| Sitikantha | - | Hindu Name | Sittichai | - | Thai Name |
| Siuluk | - | Eskimo Name | Sivakumaran | - | Indian Name |
| Sivan | - | Biblical Name | Sivanta | - | Indian Name |
| Sivard | - | Norse Name | Sivut | - | Eskimo Name |
| Siwar | - | Muslim Name | Siwili | - | American Name |
| Sixto | - | Philippines Name | Skah | - | American Name |
| Skand | - | Hindu Name | Skapti | - | Norse Name |
| Skarde | - | Norse Name | Skelly | - | Gaelic Name |
| Skene | - | Scottish Name | Skip | - | American Name |
| Skiriki | - | American Name | Skjold | - | Norse Name |
| Skuli | - | Norse Name | Sky | - | United States Name |
| Skye | - | English Name | Skylar | - | United States Name |
| Skyler | - | English Name | Slade | - | United States Name |
| Slansky | - | Czechoslovakian Name | Slater | - | English Name |
| Slaviša | - | Serbian Name | Slaviša-Milan | - | Serbian Name |
| Slevin | - | Gaelic Name | Sloan | - | Scottish Name |
| Sloane | - | English Name | Slobodan | - | Serbian Name |
| Slobodan-Mihailo | - | Serbian Name | Smarajit | - | Indian Name |
| Smarajit | - | Hindu Name | Smaran | - | Indian Name |
| Smaran | - | Hindu Name |
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