| Name | Meaning | Gender | Origin |
|---|
| Sammy | His name is God | Unisex | Hebrew |
| Sassy | Lively and spirited | Unisex | English |
| Satan | The Devil and adversary of God | Unisex | English |
| Saturn | Sixth and second largest planet away from the Sun. | Unisex | English |
| Scout | Observer | Unisex | American English |
| Shadow | Shadow | Unisex | English |
| Shark | | Unisex | Hebrew |
| Sherbert | Frozen dessert made from fruit, sugar and water. Australian slang for beer. | Unisex | English |
| Slate | | Unisex | Hebrew |
| Snuffles | | Unisex | Hebrew |
| Spirit | Part of the human being associated with the mind. Vigorous or animated state - spirited. Also distilled alcohol. | Unisex | English |
| Tank | A large metal container. A heavily armed combat vehicle | Unisex | English |
| Tex | Of Texas | Unisex | English |
| Thunder | Stormy Tempered | Unisex | English |
| Tigger | From Winnie the Pooh | Unisex | English |
| Titan | Powerful big man | Unisex | Greek |
| Topsy | On top | Unisex | English |
| Trojan | | Unisex | Hebrew |
| Valkyrie | Chooser of the slain | Unisex | Norse |
| Waffles | | Unisex | Hebrew |
| Whisper | | Unisex | Hebrew |
| Wookie | | Unisex | Hebrew |