| Name | Meaning | Gender | Origin |
|---|
| Sunny | Abounding in sunshine, cheerful | Male | Nickname |
| Sunrise | | Unisex | |
| Sunya | | Unisex | |
| Surat | | Unisex | |
| Surin | | Unisex | |
| 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 |
| Susuk | | Unisex | |
| Suttipong | | Unisex | |
| Sweboy | | Unisex | |
| Sweet Holly | | Unisex | |
| Sweet Pea | | Female | |
| Syd | Variant of Sidney from St. Denis
| Male | |
| Sydney | from city of St. Denis | Female | |
| Tab | Abbreviation of Tabor. The biblical Mt. Tabor is a landmark mountain near Nazareth.
| Male | Modern |
| Tabasco | American spicy sauce made from red peppers. | Male | |
| Taffy | Sticky candy | Male | Welsh |
| Taji | | Unisex | |
| Taksin The Great | | Unisex | |
| Tammara | Like a palm tree.
| Female | |
| Tango | | Male | |
| Tanis | Spanish abbreviation of Estanislao make famous from the name borne by several Slavic kings and three saints.
| Female | Spanish |
| Tank | A large metal container. A heavily armed combat vehicle | Unisex | |
| Tao | Philosophy and religion of China. | Unisex | |
| Tarzan | | Male | |
| Tatika | | Unisex | |