| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 1001 | Rohan | Irish | Red-haired; red. | M | |
| 1002 | Roibeard | Irish | Robin. | M | |
| 1003 | Roibin | Irish | Robin. | M | |
| 1004 | Ronan | Irish | Little seal. | M | |
| 1005 | Rooney | Irish | Hero. | M | |
| 1006 | Rorey | Irish | Red. Sixteenth-century rebel chief Rory O'More is celebrated in Irish poetry. | M | |
| 1007 | Rorke | Irish | Famous ruler. | M | |
| 1008 | Rorry | Irish | Red. Sixteenth-century rebel chief Rory O'More is celebrated in Irish poetry. | M | |
| 1009 | Rory | Irish | Red. Sixteenth-century rebel chief Rory O'More is celebrated in Irish poetry. | M | |
| 1010 | Rourke | Irish | An ancient given name adopted as an Irish clan name. Surname. | M | |
| 1011 | Rowan | Irish | Red haired Surname. | M | |
| 1012 | Rowe | Irish | Red haired. | M | |
| 1013 | Rowen | Irish | Red haired. | M | |
| 1014 | Rowin | Irish | Red haired. | M | |
| 1015 | Rowyn | Irish | Red haired. | M | |
| 1016 | Royan | Irish | Red-haired; red. | M | |
| 1017 | Ruadhagan | Irish | Red haired. | M | |
| 1018 | Ruadhan | Irish | Name of a saint. Red haired. | M | |
| 1019 | Ruaidhri | Irish | Famous ruler. Red. | M | |
| 1020 | Ruanaidh | Irish | Hero. | M | |