| Name | Meaning | Gender | Origin |
|---|
| Ranger | Gamekeeper | Male | English |
| Rascal | One that is playfully mischievous | Unisex | English |
| Remington | Settlement on the boundary stream | Male | English |
| River | River | Unisex | English |
| Rogue | | Unisex | Hebrew |
| Roman | Roman | Unisex | Latin |
| Rupert | Bright fame | Male | English |
| Sable | Sable (black) | Unisex | English |
| Sabre | | Unisex | Hebrew |
| Sammy | His name is God | Unisex | Hebrew |
| Samson | Sun | Male | Hebrew |
| Sandy | Defending men | Male | Greek |
| 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 |
| Sherlock | With cropped hair | Male | English |
| Silver | Silver (the metal or colour) | Male | English |
| Slate | | Unisex | Hebrew |
| Snuffles | | Unisex | Hebrew |
| Sol | Peace | Male | Hebrew |
| Spirit | Part of the human being associated with the mind. Vigorous or animated state - spirited. Also distilled alcohol. | Unisex | English |
| Stone | Stone | Male | English |
| Talon | A claw | Male | English |
| Tank | A large metal container. A heavily armed combat vehicle | Unisex | English |
| Tex | Of Texas | Unisex | English |
| Thor | Thunder | Male | Norse |