| Name | Meaning | Gender | Origin |
|---|
| Slick | | Male | |
| Smith | blacksmith | Male | English |
| Smoke | | Unisex | |
| Smoke | | Unisex | |
| Smokey | A grayish blue colour. Slang for highway patrol officer | Male | |
| Smokey | A grayish blue colour. Slang for highway patrol officer | Male | |
| Smokey | A grayish blue colour. Slang for highway patrol officer | Male | |
| Snickers | A brand of candy bar. | Unisex | |
| Snickers | A brand of candy bar. | Unisex | |
| Snowball | | Unisex | |
| Snowdrop | | Male | |
| Snowflake | Single flake or crystal of snow. | Unisex | |
| Snowy | Covered with snow | Unisex | |
| Sooty | Covered with soot | Unisex | |
| Sorrel | reddish brown | Male | Botanical |
| Spade | | Unisex | |
| Spooky | | Unisex | |
| Spot | after Data's cat on Star Trek: The Next Generation | Male | |
| Sprinkles | | Unisex | |
| Spumoni | | Unisex | |
| Stain | | Unisex | Hebrew |
| Starbuck | Chain of US coffee houses. | Unisex | |
| Steel | Strong metal alloy made of iron and carbon. Hard unflinching character. | Male | Word |
| Sterling | British money or coin. A type of silver. Of good character. genuine, valued | Male | English |
| Stoney | Stone-Lie | Unisex | Greek |