| Name | Meaning | Gender | Origin |
|---|
| Sine | God Is Gracious | Unisex | Irish |
| Snowy | Covered with snow | Unisex | |
| So | | Unisex | |
| Splash | To cause fluid to scatter in flying masses. To display very noticeably. | Unisex | |
| Sting | To pierce painfully with a sharp point. | Unisex | |
| 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 | |
| Taki | Japanese for waterfall | Unisex | |
| Tallula | | Unisex | Hebrew |
| Talor | | Unisex | |
| Talulah | Leaping Water | Unisex | Native American |
| Tang | | Unisex | |
| Tayna | | Unisex | Hebrew |
| Tefnut | | Unisex | |
| Teva | Nature | Unisex | English |
| Tigris | | Unisex | |
| Tiki | Maori figure representing an ancestor. A wooden or stone image of a Polynesian god. | Unisex | |
| Tlaloc | Aztec mythology: the great rain and fertility god | Unisex | |
| Tlazolteotl | Aztec mythology: the goddess of licentiousness | Unisex | |
| Triton | after Neptune's moon | Unisex | |
| Wella | Stream | Unisex | English |
| Wilburn | | Unisex | |
| Wilt | | Unisex | |
| Yaw | | Unisex | |