| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 561 | Rees | Welsh | Ardent; fiery. | M | |
| 562 | Reese | Welsh | Ardent; fiery. | M | |
| 563 | Ren | Welsh | Ruler. | M | |
| 564 | Renfrew | Welsh | Dwells near the still river. | M | |
| 565 | Rheged | Welsh | Legendary father of Gwres. | M | |
| 566 | Rhett | Welsh | Form of Rhys: ardent; fiery. Rhett Butler was hero of Margaret Mitchell's Gone With the Wind. | M | |
| 567 | Rhinffrew | Welsh | Dwells near the still river. | M | |
| 568 | Rhioganedd | Welsh | Legendary a prince of Ireland. | M | |
| 569 | Rhisiart | Welsh | Welsh form of Richard 'strong ruler'. | M | |
| 570 | Rhobert | Welsh | Welsh form of Robert 'brilliant renown'. | M | |
| 571 | Rhun | Welsh | Legendary son of Beli. | M | |
| 572 | Rhuvawn | Welsh | Legendary son of Deorthach. | M | |
| 573 | Rhyawdd | Welsh | Legendary son of Morgant. | M | |
| 574 | Rhychdir | Welsh | From the plow land. | M | |
| 575 | Rhyd | Welsh | From the ford. | M | |
| 576 | Rhys | Welsh | Ardour; rashness. | M | |
| 577 | Rice | Welsh | Ardent. | M | |
| 578 | Romney | Welsh | Dwells near the curving river. | M | |
| 579 | Rumenea | Welsh | Dwells near the curving river. | M | |
| 580 | Ryn | Welsh | Ruler. | M | |