| Name | Meaning | Gender | Origin |
|---|
| Squeaky | | Unisex | |
| Squishy | | Unisex | Hebrew |
| Stanley | Lives by the stony grove
| Male | English |
| Star | A celestial body that emits light. A famous performer. | Female | Word |
| Star | A celestial body that emits light. A famous performer. | Female | Word |
| Stardust | | Female | |
| Starlight | | Unisex | |
| Stella | a star | Female | Latin |
| Stella | a star | Female | Latin |
| Stetson | Cowboy Hat | Male | English |
| Stimpy | | Unisex | Hebrew |
| Stinker | | Unisex | |
| Stinky | | Unisex | |
| Stitch | after the character in the Lilo And Stitch cartoon | Unisex | |
| Storm | Storm
| Male | Word |
| Stormy | | Female | |
| Suede | Swedish | Male | |
| 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 |
| Sully | from the south meadow | Male | |
| Summer | summer season | Female | Word |
| Sunny | Abounding in sunshine, cheerful | Male | Nickname |
| Sweeny | | Unisex | Hebrew |
| Swiss | | Unisex | Hebrew |