| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 221 | Druson | Welsh | Son of Drew. | M | |
| 222 | Drych | Welsh | Legendary son of Kibddar. | M | |
| 223 | Drystan | Welsh | Welsh form of Tristan 'full of sorrow'. | M | |
| 224 | Dryw | Welsh | Wise. | M | |
| 225 | Drywsone | Welsh | Son of Drew. | M | |
| 226 | Duach | Welsh | Legendary son of Gwawrddur. | M | |
| 227 | Dylan | Welsh | Son of the wave, born near the sea, influence. Famous bearers: Welsh poet Dylan Thomas, American folk singer Bob Dylan. | M | |
| 228 | Dyllan | Welsh | From the sea. | M | |
| 229 | Dyllon | Welsh | From the sea. | M | |
| 230 | Dynawd | Welsh | Donation. | M | |
| 231 | Dyvynarth | Welsh | Legendary son of Gwrgwst. | M | |
| 232 | Dyvyr | Welsh | Legendary son of Alun. | M | |
| 233 | Dywel | Welsh | Legendary son of Erbin. | M | |
| 234 | Earwin | Welsh | White river. | M | |
| 235 | Earwine | Welsh | White river. | M | |
| 236 | Edern | Welsh | Legendary son of Nudd. | M | |
| 237 | Edmyg | Welsh | Honor. | M | |
| 238 | Eiddoel | Welsh | Legendary son of Ner. | M | |
| 239 | Eifion | Welsh | Welsh surname. | M | |
| 240 | Eiladar | Welsh | Legendary son of Penn Llarcan. | M | |