| Name | Meaning | Gender | Origin |
|---|
| Smokey | A grayish blue colour. Slang for highway patrol officer | Male | |
| Smokey | A grayish blue colour. Slang for highway patrol officer | Male | |
| Smudge | A blotch or smear | Male | |
| Snowflake | Single flake or crystal of snow. | Unisex | |
| Snowman | | Unisex | |
| Sootie | | Unisex | |
| Sooty | Covered with soot | Unisex | |
| Spade | | Unisex | |
| Sparkle | To shine with animation | Unisex | |
| Sparrow | a bird | Female | Nature |
| Spider | An eight legged insect | Unisex | |
| Spooky | | Unisex | |
| Spot | after Data's cat on Star Trek: The Next Generation | Male | |
| Spyda | | Unisex | |
| Starlight | | Unisex | |
| Storm | Storm
| Male | Word |
| Stormie | | Unisex | |
| Stormy | | Female | |
| Sunny | Abounding in sunshine, cheerful | Male | Nickname |
| Sunshine | Rays from the sun. Cheerfulness | Female | Word |
| Tai | great extreme | Male | Chinese |
| Tar | | Unisex | Hebrew |
| Teddy | From Edward - Prosperous guardian | Unisex | |
| Thunder | Sound produced from lightning | Unisex | |
| Thunder | Sound produced from lightning | Unisex | |