Variant spellings are included, so there may be some duplication. If you know of something that should be included, please let me know
| Rafter |
| Rafterry |
| Raftery |
| Raftry |
| Rahelly |
| Rahely |
| Rahilly |
| Rahily |
| Rape |
| Read Ulster/Virginia (archived) |
| Read Draperstown |
| Reade Ulster/Virginia (archived) |
| Reade Draperstown |
| Reagan |
| Reap |
| Reape |
| Reardan Kerry/ USA (archived) |
| Rearden Kerry/ USA (archived) |
| Reardon Kerry/ USA (archived) |
| Redan Co. Clare |
| Reddan Co. Clare |
| Reddane Co. Clare |
| Redden Co. Clare |
| Reddin Co. Clare |
| Redding Co. Clare |
| Reddon Co. Clare |
| Reed Ulster/Virginia (archived) |
| Reed Draperstown |
| Reede Ulster/Virginia (archived) |
| Reede Draperstown |
| Reegan |
| Rees Louth/ Illinois |
| Reese Louth/ Illinois |
| Regan |
| Reid Ulster/Virginia (archived) |
| Reid Draperstown |
| Reide Ulster/Virginia (archived) |
| Reide Draperstown |
| Reilly (Archived) |
| Reily (Archived) |
| Reordan Kerry/ USA (archived) |
| Reynold |
| Reynolds |
| Rice Louth/ Illinois |
| Riede Ulster/Virginia (archived) |
| Riede Draperstown |
| Rielly (Archived) |
| Riely (Archived) |
| Rierdon Kerry/ USA (archived) |
| Riley (Archived) |
| Riordan Kerry/ USA (archived) |
| Riordon Kerry/ USA (archived) |
| Roach |
| Roach (archived) |
| Roach Macroom, Co. Cork |
| Roach |
| Roache |
| Roache (archived) |
| Roache Macroom, Co. Cork |
| Roache |
| Roan |
| Roane |
| Roarke |
| Roarke |
| Roarty |
| Roberts |
| Roberts |
| Robertson |
| Robertson |
| Robinson Abbeyleix |
| Robonson Abbeyleix |
| Roch |
| Roch (archived) |
| Roch Macroom, Co. Cork |
| Roch |
| Roche |
| Roche (archived) |
| Roche Macroom, Co. Cork |
| Roche |
| Rock |
| Rocke |
| Roddey |
| Roddy |
| Rodger Sligo/Mayo |
| Rodgers Sligo/Mayo |
| Rody |
| Roger Sligo/Mayo |
| Rogers Sligo/Mayo |
| Rorety |
| Rorke |
| Rorke |
| Rory Sligo/Mayo |
| Rossiter |
| Rossiter |
| Rossitor |
| Rossitor |
| Rouane Kiltimagh, Co. Mayo |
| Rouane |
| Rouen Kiltimagh, Co. Mayo |
| Rouen |
| Rourk |
| Rourk |
| Rourke |
| Rourke |
| Rowan |
| Ruan Kiltimagh, Co. Mayo |
| Ruan |
| Ruane Kiltimagh, Co. Mayo |
| Ruane |
| Ruaun Kiltimagh, Co. Mayo |
| Ruaun |
| Rutledge Carrick-on-Shannon, Co. Leitrim |
| Rutledge |
| Ryan Cappawhite, Co. Tipperary /Franklin Co., NY |
| Ryan |
| Ryan Tipperary / Long Island |
| Ryan Garryhill, Co. Carlow |
| Ryan |