| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 201 | Deverell | Welsh | From the river bank. | M | |
| 202 | Deverril | Welsh | From the river bank. | M | |
| 203 | Dewey | Welsh | The Lord's. | M | |
| 204 | Dewi | Welsh | Variant of David: Beloved or friend, from the Hebrew. Sixth century St David (or Dewi) was patron saint of Wales. | M | |
| 205 | Digon | Welsh | Legendary son of Alar. | M | |
| 206 | Dilan | Welsh | Born near the sea. | M | |
| 207 | Dillan | Welsh | Variant of Dylan: Ocean's son. | M | |
| 208 | Dillie | Welsh | Born near the sea. | M | |
| 209 | Dillon | Welsh | Born near the sea. | M | |
| 210 | Dillus | Welsh | Legendary son of Eurei. | M | |
| 211 | Dillwyn | Welsh | Variant of Dilwyn: Blessed truth. | M | |
| 212 | Dilwyn | Welsh | Blessed truth. | M | |
| 213 | Dirrnyg | Welsh | Legendary son of Caw. | M | |
| 214 | Donne | Welsh | Used in honor of 17th century poet John Donne. | M | |
| 215 | Dover | Welsh | Water. A British seaport on the English channel. | M | |
| 216 | Drem | Welsh | Sight. | M | |
| 217 | Dremidydd | Welsh | Legendary father of Drem. | M | |
| 218 | Drew | Welsh | Wise. | M | |
| 219 | Druce | Welsh | Son of Drew. | M | |
| 220 | Drudwas | Welsh | Legendary son of Tryffin. | M | |