| Name | Meaning | Gender | Origin |
|---|
| Russell | Little red one | Male | French |
| Rusty | Rusty, full of rust | Unisex | American English |
| Ruth | Friend | Female | Hebrew |
| Sable | Sable (black) | Unisex | English |
| Sadie | Princess | Female | Hebrew |
| Sam | He is called god | Male | Hebrew |
| Sassy | Lively and spirited | Unisex | English |
| Shade | Sweetly singing | Unisex | African |
| Shadow | Shadow | Unisex | English |
| Sheridan | Long lived treasure | Unisex | Gaelic |
| Sienna | Reddish orange-brown | Female | Italian |
| Sir | | Unisex | Hebrew |
| Smokey | A grayish blue colour. Slang for highway patrol officer | Unisex | English |
| Smudge | A blotch or smear | Unisex | English |
| Snickers | A brand of candy bar. | Unisex | English |
| Solomon | Peace | Male | Hebrew |
| Sophie | Wisdom | Female | Greek |
| Spike | A long, thick sharp-pointed piece of wood or metal | Male | English |
| Spot | After Data's cat on Star Trek: The Next Generation | Unisex | English |
| Stanley | Meadow that is stony | Male | English |
| Starbuck | Star Deer | Unisex | English |
| Stone | Stone | Male | English |
| Storm | Violent weather | Female | English |
| Sweet | | Unisex | Hebrew |
| Tab | Brilliant | Male | English |
| Teddy | Gift of God | Male | Greek |
| Tex | Of Texas | Unisex | English |
| Theron | Hunter | Male | Greek |
| Thornton | Thorn bush enclosure or settlement | Male | English |
| Tiki | Maori figure representing an ancestor. A wooden or stone image of a Polynesian god. | Unisex | English |