| Name | Meaning | Gender | Origin |
|---|
| Spitfire | | Unisex | |
| Spy | | Unisex | Hebrew |
| Squirrel | | Unisex | |
| Stacy | Greek, feminine variation of Anastasios, resurrection | Female | English |
| Stardust | | Female | |
| Starfire | | Unisex | |
| Storm | Storm
| Male | Word |
| Sun | obedient | Female | Korean |
| SuperGirl | | Unisex | Hebrew |
| Susan | Lily Diminutive of Susannah also used as an independent name. In the apocryphal Book of Tobit Susannah courageously defended herself against wrongful accusation. White lilies grew in the Biblical city of Susa in Persia.
| Female | Hebrew |
| Swift | | Unisex | |
| Tara | A hill where the kings met
| Female | Irish |
| Terra | earth | Female | Latin |
| Thor | Viking mythology: the ruler of the weather | Male | Norse |
| Thunder | Sound produced from lightning | Unisex | |
| Thunder | Sound produced from lightning | Unisex | |
| Thunder | Sound produced from lightning | Unisex | |
| Tigra | | Unisex | Hebrew |
| Topaz | A yellow gemstone | Female | Greek |
| Tsunami | Tidal wave | Unisex | |
| Turbo | Driven by a turbine - turbocharged | Unisex | |
| Tyra | | Female | |
| Una | One.
| Female | Latin |
| Valkyrie | Chooser of the slain | Unisex | Norse |
| Vashti | lovely | Female | Persian |