| Name | Meaning | Gender | Origin |
|---|
| Rainbow | Rainbow | Unisex | English |
| Rainier | Wise army | Male | Germanic |
| Ram | Pleasing | Male | Sanskrit |
| Rambo | | Unisex | Hebrew |
| Raynard | Strong Counselor. | Male | English |
| Rogan | Red Haired | Male | English |
| Rogue | | Unisex | Hebrew |
| Roman | Roman | Unisex | Latin |
| Sabre | | Unisex | Hebrew |
| Sammy | His name is God | Unisex | Hebrew |
| Samson | Sun | Male | Hebrew |
| Sandy | Defending men | Male | Greek |
| Saphire | Beautiful jewel | Unisex | Greek |
| Sasha | Defending men | Unisex | Greek |
| Sasquatch | Has extra toes and hence is a bigfoot | Unisex | English |
| 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 |
| Saul | Responded | Male | Hebrew |
| Shark | | Unisex | Hebrew |
| Silvester | A forest | Male | Latin |
| Snowflake | Single flake or crystal of snow. | Unisex | English |
| Stefan | Crown | Male | Greek |
| Stein | Stone | Male | Germanic |
| Tab | Brilliant | Male | English |
| Talon | A claw | Male | English |
| Tank | A large metal container. A heavily armed combat vehicle | Unisex | English |
| Terrance | Uncertain | Male | Latin |
| Tex | Of Texas | Unisex | English |
| Thunder | Stormy Tempered | Unisex | English |