| Name | Meaning | Gender | Origin |
|---|
| Remus | | Male | |
| Rex | after the Rex Banner character in The Simpsons cartoons | Male | Latin |
| Riddle | | Male | Hebrew |
| Rigel | Foot. Rigel is a blue star of the first magnitude that marks the hunter's left foot in the Orion constellation.
| Male | |
| Robert | Famed: bright: shining. 14th-century King Robert the Bruce. Robert Burns the poet.
| Male | English |
| Robin | Famed: bright: shining Form of Robert popular since the medieval days of Robin Hood. Robinson: (English) Son of Robert Famed: bright: shining. Surname.
| Male | |
| Rodolphus Lestrange | married Bellatrix Black.
| Male | |
| Ron Weasley | Harry's best friend.
| Male | |
| Roo | | Unisex | Hebrew |
| Rory | aka Rors | Male | Irish |
| Rudy | From Rudolph - Famous wolf | Male | |
| Rusty | Covered in rust - a brownish red colour. | Unisex | |
| Saffi | Wisdom | Unisex | Danish |
| Salazar Slytherin | | Unisex | |
| Salim | Peace
| Male | Arabic |
| Samson | Bright sun
| Male | Hebrew |
| Sandy | Abbreviation of Alexander defender of man.
| Male | Scottish |
| Sashi | Moonbeam | Unisex | Hindu |
| Satchmo | | Unisex | Hebrew |
| Scat Cat | | Unisex | |
| Schnitzel | | Male | Hebrew |
| Scrooge | | Male | Hebrew |
| Scully | Herald
| Male | Irish |
| Sherlock | Blond
| Male | English |
| Silver | White
| Male | English |