| Name |
Pronunciation |
Meaning |
English Spelling |
Gender |
| Ragnall, Raghnall | (RAY-nal) | | Randal, Rannal | M |
| Ragnailt, Raghnailt | (RAY-nilt) | fem. form of Ragnall | Reynalda | F |
| Raichbe, Raichbhe | (RAY-va) | | | F |
| Rathnat, Rathnait | (ROH-nit) | | | F |
| Rebachán, Reabhachán | (RO-kawn) | | Rowan, Rohan | M |
| Rechtabra, Reachtabhra, Reachtúra | (RACHT-ur-a) | | | M |
| Rémann, Réamonn | (RAY-mon) | Old German ragan "counsel" mund "protection" | Raymond, Redmond | M |
| Riaguil, Riaghail | (REEL) | | | M |
| Ríán, Rian | (REE-an) | dim. of rí, a king | Ryan | M |
| Ricard, Riocard | (RICK-ard) | borrowing from Richard | | M |
| Rígán, Ríoghán | (REE-awn) | dim. of rí, a king | Regan | M |
| Rígbarddán, Ríoghbhardán,
Ríordán | (REER-dan) | royal poet | Riordan, Reardon | M |
| Rígnach, Ríoghnach, Ríonach | (REE-nach) | queenly | Reenagh | F |
| Ríomthach, Ríomhthach, Ríofach | (REE-fach) | | Riofagh | F |
| Robartach, Robhartach | (RO-ar-tach) | rushing, impetuous | Roarty | M |
| Rodán | (ro-DAWN) | | | M |
| Rogellach, Rogallach, Raghallach | (REIL-ach) | | Reilly | M |
| Róinsech, Rónsech, Róinseach | (ROWN-sach) | from rón, "a seal" | | F |
| Róis, Róise, Rós | (ROSE) | a rose | Rose | F |
| Róisín | (ro-SHEEN) | dim. of Rós, a rose | Rosheen, Roisin | F |
| Rónán | (RO-nawn) | from rón, "a seal" | Ronan | M |
| Rónchú | (ROWN-koo) | seal-hound | | M |
| Rónnat, Róonait, Rónnad | (RON-it) | fem. form of Rónán | | F |
| Ross, Russ, Rosa | (RUSS) | | Ross, Russ | M |
| Rúadacán, Rúadhagán | (ROO-a-gawn) | red-haired | | M |
| Rúadán, Rúadhán | (ROO-awn) | red-haired | Rowan | M |
| Rúadnat, Rúadnait | (ROO-nit) | fem. form of Rúadán | | F |
| Ruaidrí, Ruaidhrí, Ruairí | (ROO-a-ree, ROW-ree) | red king | Rory | M |
| Ruarcc, Ruarc | (ROO-ark) | a hero, a champion | Rourke | M |
| Rudraige, Rudhraighe, Ruaraí | (ROO-a-ree) | | Rory | M |
| Ruissíne, Ruisín | (rus-EEN) | dim. of Ross | | M |
| Rumann, Rumhann | (ROO-van) | early Irish poet | | M |