| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| 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 | ||
| RuaidhrÍ | ROR-ee | Irish | ||
| RuaidrÍ | - | Irish | ||
| RuairÍ | - | Irish | ||
| Ruarc | - | Irish | ||
| Ryan | RIE-ən | Irish, English |