| Name | Meaning | Gender | Origin |
|---|
| Snowball | | Unisex | |
| Socks | Short stockings finishing above the ankle | Unisex | |
| Solan | | Unisex | Hebrew |
| Solomon | Wise and peaceful | Male | Hebrew |
| Solt | | Unisex | Hebrew |
| Sonny | A boy or young man. | Male | Nickname |
| Spencer | Shopkeeper, dispenser, keeper | Male | English |
| Spike | A long, thick sharp-pointed piece of wood or metal | Male | American |
| Spock | | Unisex | |
| Spooky | | Unisex | |
| Stanley | Lives by the stony grove
| Male | English |
| Steed | | Unisex | |
| Stephen | crown | Male | Greek |
| Sterling | British money or coin. A type of silver. Of good character. genuine, valued | Male | English |
| Stud | | Unisex | Hebrew |
| Sullivan | black-eyed one | Male | Irish |
| Sully | from the south meadow | Male | |
| Sunny | Abounding in sunshine, cheerful | Male | Nickname |
| Surya | the sun | Female | Hindi |
| Sutherland | From Sutherland
| Male | |
| Sven | youth | Male | Norse |
| Sweeny | | Unisex | Hebrew |
| Sylvester | A cartoon cat that tried to eat the bird character Tweety. He was a black and white cat.
| Male | Latin |
| Tab | Abbreviation of Tabor. The biblical Mt. Tabor is a landmark mountain near Nazareth.
| Male | Modern |
| Tabby | | Unisex | |