| Silviah | A spirit of the green forest. |
| Silviano | Forest dweller, a Latin name with natural connotations |
| Silya | A name meaning heavenly or celestial. |
| Simbiah | Gift of God, a variant of the name Simba |
| Simecek | A surname meaning a small family unit. |
| Simione | God has heard the prayer. |
| Simmone | One who listens well |
| Simonne | One who listens well |
| Sindre | Victorious protector, a Scandinavian name with mythological roots |
| Sinhue | Gift of the gods, a variant of the name Sinhue |
| Sinqua | Derived from the Latin word for 'five' or 'quintessence'. |
| Sire | French name meaning 'lord' or 'master'. |
| Sisamila | Sanskrit name meaning 'beautiful' or 'lovely'. |
| Sissey | A name meaning a blind noble lady. |
| Sitka | Derived from the Tlingit word for 'people of the marsh'. |
| Siusana | A graceful and lilylike soul. |
| Sixte | A name meaning the sixth child. |
| Skandar | Persian name meaning 'bringer of good fortune'. |
| Skate | English name meaning 'to glide on ice'. |
| Skia | Greek name meaning 'shadow' or 'shade'. |
| Skyee | From the isle of skye |
| Skylaa | A variation meaning the sky. |
| Skylla | Derived from a sea monster. |
| Skyye | From the isle of skye |
| Slaid | Scottish name meaning 'battle' or 'warrior'. |
| Slavko | Slavic name meaning 'glory' or 'fame'. |
| Slayden | English name meaning 'valiant warrior' or 'brave fighter'. |
| Smarth | Sanskrit name meaning 'intelligent' or 'wise'. |
| Snuffleupagus | Fictional name from the children's book 'Sesame Street'. |
| So Young | A combination of beautiful and everlasting. |
| Soeren | Danish name meaning 'stern' or 'serious'. |
| Sofee | One who is full of wisdom |
| Soffee | A variant meaning wisdom. |
| Soffi | A short form meaning wisdom. |
| Soffia | A variant meaning wisdom. |
| Soffiah | A variant meaning wisdom. |
| Soffie | A variant meaning wisdom. |
| Soffy | A variant meaning wisdom. |
| Sofien | French name meaning 'wise' or 'intelligent'. |
| Sofiyah | A name meaning wise or intelligent. |