| Name | Meaning | Gender | Origin |
|---|
| Sid | | Unisex | |
| Sine | God Is Gracious | Unisex | Irish |
| Slate | | Male | |
| Snowy | Covered with snow | Unisex | |
| So | | Unisex | |
| Solomon | Wise and peaceful | Male | Hebrew |
| Spike | A long, thick sharp-pointed piece of wood or metal | Male | American |
| Splash | To cause fluid to scatter in flying masses. To display very noticeably. | Unisex | |
| Sting | To pierce painfully with a sharp point. | Unisex | |
| Storm | Storm
| Male | Word |
| Stratford | From The River Ford On The Street | Unisex | English |
| Styx | from Greek mythology, the river that formed the boundary between earth and the underworld | Unisex | |
| Syd | Variant of Sidney from St. Denis
| Male | |
| Taft | building site | Male | English |
| Tahoe | edge of the lake | Male | Native |
| Taki | Japanese for waterfall | Unisex | |
| Talbot | reward | Male | English |
| Tallula | | Unisex | Hebrew |
| Talor | | Unisex | |
| Talulah | Leaping Water | Unisex | Native American |
| Tang | | Unisex | |
| Tayna | | Unisex | Hebrew |
| Tefnut | | Unisex | |
| Teva | Nature | Unisex | English |
| Thor | Viking mythology: the ruler of the weather | Male | Norse |