| Name | Meaning | Gender | Origin |
|---|
| Ranger | dweller in the field A warden employed to protect a forest area. | Male | |
| Ripley | after the novel and the movie The Talented Mr. Ripley | Male | English |
| Rocket | To move swiftly and powerfully | Male | Word |
| Rocko | | Male | |
| Rogue | | Male | |
| Roo | | Unisex | Hebrew |
| Royce | son of the king | Male | English |
| Rush | red-haired | Male | English |
| Rusty | Covered in rust - a brownish red colour. | Unisex | |
| Sailor | One who serves in the navy or works on a ship. | Male | Occupational |
| Scooby | | Unisex | |
| Scout | One dispatched from main body to gather information | Male | Word |
| Seneca | people of the standing rock | Male | Latin |
| Silver | White
| Male | English |
| Simba | lion | Male | Swahili |
| Simba | from The Lion King | Male | Swahili |
| Soso | | Unisex | |
| Stetson | Cowboy Hat | Male | English |
| Storm | Storm
| Male | Word |
| Stormie | | Unisex | |
| Story | | Male | |
| Swayze | | Unisex | |
| Sylar | | Unisex | |
| Tangy | | Unisex | |
| Taro | Japanese - first born boy. Edible starchy plant. | Unisex | |