| Name | Meaning | Gender | Origin |
|---|
| Ranger | Gamekeeper | Male | English |
| Raven | Raven | Male | English |
| Reagan | Descendent of Riagán | Unisex | Gaelic |
| Rebel | One that resists of defies authority | Unisex | English |
| Regan | Regal | Male | Gaelic |
| Remington | Settlement on the boundary stream | Male | English |
| Reno | Ruler with counsel | Unisex | Germanic |
| Rex | King | Male | Latin |
| Ripley | Separate | Male | English |
| Rocky | Battle cry | Male | Germanic |
| Rogue | | Unisex | Hebrew |
| Ronin | Little seal | Male | Gaelic |
| Ryder | One who rides | Unisex | English |
| Saber | Patient | Male | English |
| Sable | Sable (black) | Unisex | English |
| Salem | Secure, peace | Unisex | Arabic |
| Samson | Sun | Male | Hebrew |
| Sarge | Noncommissioned Army or Air Force rank | Unisex | English |
| Sasquatch | Has extra toes and hence is a bigfoot | Unisex | English |
| Scar | From The Lion King | Unisex | English |
| Scotch | Scotch whiskey. | Unisex | English |
| Seraphim | An Angel Like Being Of A Lower Order | Male | English |
| Shadow | Shadow | Unisex | English |
| Shepherd | One who guards sheeps | Male | English |
| Sherman | One who shears cloth | Male | English |
| Skinner | | Unisex | Hebrew |
| Smokey | A grayish blue colour. Slang for highway patrol officer | Unisex | English |
| Snake | | Unisex | Hebrew |
| Sniper | A skilled shooter who spots targets from a concealed place. | Unisex | English |
| Spider | An eight legged insect | Unisex | English |