| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Reagan | RAY-gən | English, Irish | ||
| Rearden | - | Irish | ||
| Redmond | - | Irish | ||
| Redmund | - | Irish | ||
| RiagÁN | - | Irish | ||
| Riordan | - | Irish | ||
| RisteÁRd | - | Irish | ||
| RoibeÁRd | - | Irish | ||
| Ronit (1) | - | Irish | ||
| Rorie | RAWR-ee | Irish, Scottish | ||
| Rory | RAWR-ee | Irish, Scottish | ||
| Rosheen | - | Irish | ||
| Rowan | RO-ən (English) | Irish, English (Modern) | ||
| Ruadh | - | Irish, Scottish | ||
| RuadhÁN | ROO-awn | Irish |