| Name | Meaning | Gender | Origin |
|---|
| Rat | | Unisex | |
| Raul | Form of Ralph wolf counsel.
| Male | Spanish |
| Ray | kingly | Male | English |
| Razz | | Unisex | Hebrew |
| Red | A primary colour resembling the colour of blood | Male | Color |
| Reef | | Male | Hebrew |
| Reese | ardor | Female | Welsh |
| Rex | after the Rex Banner character in The Simpsons cartoons | Male | Latin |
| Rhett | Enthusiastic, stream.
| Male | English |
| Rhodes | dweller by the crosses; roses | Male | Greek |
| Rick | aka Richard, Dick and Little Man | Male | English |
| Riff | | Unisex | Hebrew |
| Rip | ripe, full grown | Male | Dutch |
| Ritz | | Male | |
| Rix | | Unisex | Hebrew |
| Rock | Italian from German, rest | Male | English |
| Rolf | Fame, Wolf | Unisex | German |
| Ron | Ronald | Unisex | |
| Roo | | Unisex | Hebrew |
| Rose | Flower
| Female | Latin |
| Ross | from the TV sitcom Friends | Male | Scottish |
| Rouge | | Unisex | |
| Roy | regal one, Red haired | Male | |
| Royce | son of the king | Male | English |
| Roz | Rose | Female | Polish |