| Name | Meaning | Gender | Origin |
|---|
| Pluto | Wealth, riches | Unisex | Greek |
| Queen | Female ruler | Unisex | English |
| Rambo | | Unisex | Hebrew |
| Rascal | One that is playfully mischievous | Unisex | English |
| Red | Red | Unisex | English |
| Reggie | Ruler with counsel | Unisex | Germanic |
| Rogue | | Unisex | Hebrew |
| Ronnie | Ruler with counsel | Unisex | Norse |
| Rusty | Rusty, full of rust | Unisex | American English |
| Sammy | His name is God | Unisex | Hebrew |
| Sasha | Defending men | Unisex | Greek |
| Sassy | Lively and spirited | Unisex | English |
| Scout | Observer | Unisex | American English |
| Scrappie | | Unisex | Hebrew |
| Shadow | Shadow | Unisex | English |
| Smiley | | Unisex | Hebrew |
| Smoky | | Unisex | Hebrew |
| Socks | Short stockings finishing above the ankle | Unisex | English |
| Sonic | Approaching the speed of sound, fast-paced | Unisex | English |
| Sparky | Animated, lively. | Unisex | English |
| Sprite | Lemonade flavored soft drink. | Unisex | English |
| Stitch | After the character in the Lilo And Stitch cartoon | Unisex | English |
| Tank | A large metal container. A heavily armed combat vehicle | Unisex | English |
| Taz | Wild Animal, Thrid Born | Unisex | American |
| Toby | God is good | Unisex | Hebrew |
| True | Strength of the spear | Unisex | Germanic |
| Zues | | Unisex | Hebrew |