| Name | Meaning | Gender | Origin |
|---|
| Rex | after the Rex Banner character in The Simpsons cartoons | Male | Latin |
| Richard | powerful ruler; brave one | Male | |
| Ripley | after the novel and the movie The Talented Mr. Ripley | Male | English |
| Robert | Famed: bright: shining. 14th-century King Robert the Bruce. Robert Burns the poet.
| Male | English |
| Rocco | rest | Male | Italian |
| Rococo | | Unisex | Hebrew |
| Rogers | | Unisex | |
| Rover | A wanderer | Unisex | |
| Royce | son of the king | Male | English |
| Rubin | | Unisex | |
| Rudy | From Rudolph - Famous wolf | Male | |
| Rush | red-haired | Male | English |
| Sallie | Princess | Unisex | English |
| Salty | | Unisex | Hebrew |
| Samson | Bright sun
| Male | Hebrew |
| Samuel | his name is God | Male | Hebrew |
| Sandy | Abbreviation of Alexander defender of man.
| Male | Scottish |
| Sargent | officer, to serve | Male | Spelling |
| Scooby | | Unisex | |
| Selmer | Divine Protector | Unisex | German |
| Seneca | people of the standing rock | Male | Latin |
| Seymour | From St. Maur
| Male | English |
| Shade | | Male | |
| Shaggy | Bushy and matted (hair), unkempt. | Unisex | |
| Sheldon | protected hill | Male | English |