| Name | Meaning | Gender | Origin |
|---|
| Snoopy | | Male | |
| Soccer Ball | | Unisex | |
| Socks | Short stockings finishing above the ankle | Unisex | |
| Sox | Short stockings finishing above the ankle | Unisex | |
| Sox | Short stockings finishing above the ankle | Unisex | |
| Spats | | Unisex | |
| Speck | | Male | Hebrew |
| Spot | after Data's cat on Star Trek: The Next Generation | Male | |
| Spots | | Unisex | |
| Starburst | | Unisex | Hebrew |
| Starlight Mint | | Unisex | |
| Stinky | | Unisex | |
| Storm | Storm
| Male | Word |
| Storm Trooper | | Unisex | |
| Stormy | | Female | |
| Stripes | | 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 |
| Sundae | | Unisex | |
| Sylvester | A cartoon cat that tried to eat the bird character Tweety. He was a black and white cat.
| Male | Latin |
| Tennessee | | Male | Hebrew |
| Tom | Bartender at the Leaky Cauldron.
| Male | English |
| Tommy | From Thomas - The twin. | Male | English |
| Topper | Hill | Unisex | German |
| Trooper | A state or mounted police officer. Also a member of a cavalry unit. | Unisex | |