| Name | Meaning | Gender | Origin |
|---|
| Rajah | Anticipation | Unisex | Arabic |
| Rambo | | Unisex | Hebrew |
| Rebel | One that resists of defies authority | Unisex | English |
| Regis | Kingly | Male | English |
| Remington | Settlement on the boundary stream | Male | English |
| Rex | King | Male | Latin |
| Riddick | Farm where reeds grow | Unisex | English |
| Rocco | Battle cry | Male | Germanic |
| Rock | Stone | Male | English |
| Rocky | Battle cry | Male | Germanic |
| Roman | Roman | Unisex | Latin |
| Sabre | | Unisex | Hebrew |
| Samson | Sun | Male | Hebrew |
| Sarge | Noncommissioned Army or Air Force rank | Unisex | English |
| Shady | | Unisex | Hebrew |
| Shiv | Lord Shiva | Male | Hindu |
| Spike | A long, thick sharp-pointed piece of wood or metal | Male | English |
| Stone | Stone | Male | English |
| Talon | A claw | Male | English |
| Tango | | Unisex | Hebrew |
| Tank | A large metal container. A heavily armed combat vehicle | Unisex | English |
| Taz | Wild Animal, Thrid Born | Unisex | American |
| Terminator | | Unisex | Hebrew |
| Thor | Thunder | Male | Norse |
| Thunder | Stormy Tempered | Unisex | English |
| Tiger | Tiger | Unisex | English |
| Titan | Powerful big man | Unisex | Greek |
| Turbo | Driven by a turbine - turbocharged | Unisex | English |
| Tyson | Son of Dye | Male | English |
| Ulysses | Walker | Male | Greek |