| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 301 | Druce | Welsh | Son of Drew. | M | |
| 302 | Drudwas | Welsh | Legendary son of Tryffin. | M | |
| 303 | Druson | Welsh | Son of Drew. | M | |
| 304 | Drych | Welsh | Legendary son of Kibddar. | M | |
| 305 | Drysi | Welsh | Thorn. | F | |
| 306 | Drystan | Welsh | Welsh form of Tristan 'full of sorrow'. | M | |
| 307 | Dryw | Welsh | Wise. | M | |
| 308 | Drywsone | Welsh | Son of Drew. | M | |
| 309 | Du | Welsh | Dark. | F | |
| 310 | Duach | Welsh | Legendary son of Gwawrddur. | M | |
| 311 | Dylan | Welsh | Son of the wave, born near the sea, influence. Famous bearers: Welsh poet Dylan Thomas, American folk singer Bob Dylan. | M | |
| 312 | Dyllan | Welsh | From the sea. | M | |
| 313 | Dyllon | Welsh | From the sea. | M | |
| 314 | Dynawd | Welsh | Donation. | M | |
| 315 | Dyvynarth | Welsh | Legendary son of Gwrgwst. | M | |
| 316 | Dyvyr | Welsh | Legendary son of Alun. | M | |
| 317 | Dywel | Welsh | Legendary son of Erbin. | M | |
| 318 | Earwin | Welsh | White river. | M | |
| 319 | Earwine | Welsh | White river. | M | |
| 320 | Ebrill | Welsh | Born in April. | F | |