| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 1581 | Ruaidhri | Irish | Famous ruler. Red. | M | |
| 1582 | Ruanaidh | Irish | Hero. | M | |
| 1583 | Ruarc | Irish | Famous ruler. | M | |
| 1584 | Ruark | Irish | Famous ruler. | M | |
| 1585 | Ryan | Irish | Kingly. Famous Bearer: American actor Ryan O'Neal. | M | |
| 1586 | Rye | Irish | Island meadow. | M | |
| 1587 | Ryen | Irish | Kingly. | M | |
| 1588 | Rylan | Irish | Island meadow. | M | |
| 1589 | Ryland | Irish | Island meadow. | M | |
| 1590 | Ryleigh | Irish | Island meadow. | M | |
| 1591 | Ryley | Irish | Island meadow. | M | |
| 1592 | Ryon | Irish | Kingly. | M | |
| 1593 | Sadbh | Irish | Good. | F | |
| 1594 | Sadhbba | Irish | Wise. | F | |
| 1595 | Sadhbh | Irish | Wise. | F | |
| 1596 | Saraid | Irish | Excellent. | F | |
| 1597 | Scanlan | Irish | Scandal. | M | |
| 1598 | Scanlon | Irish | Scandal. | M | |
| 1599 | Scannalan | Irish | Scandal. | M | |
| 1600 | Scolaighe | Irish | Herald. | M | |