| Name | Meaning | Gender | Origin |
|---|
| Snuggles | To curl up closely, cuddle | Male | |
| Socks | Short stockings finishing above the ankle | Unisex | |
| Soda | A carbonated water. | Unisex | |
| Solo | | Unisex | |
| Sonic | Approaching the speed of sound, fast-paced | Unisex | |
| Sookie | lily | Female | English |
| Sophia | Wisdom.
| Female | Greek |
| Sophie | Wisdom. Variant of Sophia
| Female | |
| Soy | | Unisex | |
| Space | | Unisex | |
| Spencer | Shopkeeper, dispenser, keeper | Male | English |
| Spice | Plant used to flavour food or beverages. | Unisex | |
| Spike | A long, thick sharp-pointed piece of wood or metal | Male | American |
| Spook | | Unisex | |
| Spooky | | Unisex | |
| Spyder | | Unisex | |
| Squeaky | | Unisex | |
| 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 |
| Stella | a star | Female | Latin |
| Stella | a star | Female | Latin |
| Sterling | British money or coin. A type of silver. Of good character. genuine, valued | Male | English |
| Stormy | | Female | |
| Strider | | Unisex | Hebrew |