| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 981 | Raighne | Irish | Mighty. | M | |
| 982 | Redmond | Irish | A Form of Raymond: counselor. Surname. | M | |
| 983 | Regan | Irish | Little king. | M | |
| 984 | Reidhachadh | Irish | From the smooth field. | M | |
| 985 | Reilley | Irish | Rye. Form of Ryley. | M | |
| 986 | Reilly | Irish | Surname. Rye. Form of Ryley. | M | |
| 987 | Renny | Irish | Mighty. | M | |
| 988 | Reynolds | Irish | Surname. | M | |
| 989 | Riagan | Irish | Little king. | M | |
| 990 | Rian | Irish | Kingly. | M | |
| 991 | Riddoc | Irish | From the smooth field. | M | |
| 992 | Riddock | Irish | From the smooth field. | M | |
| 993 | Riley | Irish | Rye. Form of Ryley. Surname. | M | |
| 994 | Riobard | Irish | Royal bard. | M | |
| 995 | Rion | Irish | Kingly. | M | |
| 996 | Riordain | Irish | Bright. | M | |
| 997 | Riordan | Irish | Bright. | M | |
| 998 | Roane | Irish | Red-haired; red. | M | |
| 999 | Roark | Irish | Famous ruler. | M | |
| 1000 | Rogan | Irish | Red haired. | M | |