| Name | Meaning | Gender | Origin |
|---|
| Rebastan Lestrange | Rodolphus' brother.
| Male | |
| Red | A primary colour resembling the colour of blood | Male | Color |
| Reese | ardor | Female | Welsh |
| Regina | Queen
| Female | Latin |
| Regulus Black | Sirius' brother, Death Eater killed by Voldemort.
| Male | |
| Rembrandt | | Male | |
| Rex | after the Rex Banner character in The Simpsons cartoons | Male | Latin |
| Reymond | Guards wisely.
| Male | |
| Rhiannon | divine queen | Female | Welsh |
| Rhubarb | | Male | |
| Ribbon | | Unisex | Hebrew |
| Ringo | apple, peace be with you | Male | English |
| Ripple | | Unisex | Hebrew |
| Rivka | Captivating
| Female | Hebrew |
| Roch | Glory
| Female | |
| Ronan | a pledge | Male | Irish |
| Rose | Flower
| Female | Latin |
| Rosie | From Rose - The most beautiful of flowers | Female | English |
| Ross | from the TV sitcom Friends | Male | Scottish |
| Roxie | Persian, dawn | Female | English |
| Roz | Rose | Female | Polish |
| Ruby | Jewel
| Female | Latin |
| Ruffles | A strip of frilled fabric. Irregular | Unisex | |
| Russell | Red as a fox. | Male | |
| Saffron | A cooking spice | Female | Spice |