| Name | Meaning | Gender | Origin |
|---|
| Star | A celestial body that emits light. A famous performer. | Female | Word |
| Stella | a star | Female | Latin |
| Stella | a star | Female | Latin |
| Steve | garland, crown | Male | English |
| Stewie | | Unisex | |
| Storm | Storm
| Male | Word |
| Stormy | | Female | |
| Stripe | | Unisex | |
| 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 |
| Suki | beloved | Female | Japanese |
| Summer | summer season | Female | Word |
| Sunny | Abounding in sunshine, cheerful | Male | Nickname |
| Sunshine | Rays from the sun. Cheerfulness | Female | Word |
| Sushi | Raw fish. | Unisex | |
| Sushi | Raw fish. | Unisex | |
| Suzie | | Female | |
| Sweetie | Sweetheart. | Male | |
| Syd | Variant of Sidney from St. Denis
| Male | |
| Sydney | from city of St. Denis | Female | |
| Sylvester | A cartoon cat that tried to eat the bird character Tweety. He was a black and white cat.
| Male | Latin |
| Tabasco | American spicy sauce made from red peppers. | Male | |
| Tabby | | Unisex | |
| Tabitha | gazelle, roe-buck | Female | Aramaic |