| Name | Meaning | Gender | Origin |
|---|
| Stella | a star | Female | Latin |
| Storm | Storm
| Male | Word |
| Styx | from Greek mythology, the river that formed the boundary between earth and the underworld | Unisex | |
| Sugar | A sweet powder from sugar cane. Slang for sweetheart. | Female | Literary |
| Sugar | A sweet powder from sugar cane. Slang for sweetheart. | Female | Literary |
| Sultan | A ruler of a Moslem country | Male | Swahili |
| Summer | summer season | Female | Word |
| Sunflower | | Unisex | |
| Sunny | Abounding in sunshine, cheerful | Male | Nickname |
| Suri | princess | Female | 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 |
| Sushi | Raw fish. | Unisex | |
| Sushi | Raw fish. | Unisex | |
| Sweet | | Unisex | Hebrew |
| Sweety | | Female | |
| Swift | | Unisex | |
| Tabasco | American spicy sauce made from red peppers. | Male | |
| Tabby | | Unisex | |
| Talker | | Unisex | Hebrew |
| Tangelo | Orange coloured citrus fruit. | Unisex | |
| Tangerine | From Tangiers
| Female | Word |
| Tank | A large metal container. A heavily armed combat vehicle | Unisex | |
| Tanner | leather worker | Male | English |
| Tansy | immortality, flower name | Female | Greek |
| Tao | Philosophy and religion of China. | Unisex | |