| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 261 | Daned | Welsh | Legendary son of Oth. | M | |
| 262 | Daniel | Welsh | Attractive. A translation of the Welsh name Deiniol. | M | |
| 263 | Daryn | Welsh | Great. | M | |
| 264 | Dave | Welsh | Diminutive of David: Beloved or friend, from the Hebrew. Sixth century St David (or Dewi) was patron saint of Wales. | M | |
| 265 | David | Welsh | Beloved or friend, from the Hebrew. Sixth century St David (or Dewi) was patron saint of Wales. | M | |
| 266 | Davies | Welsh | Surname. Variant of David 'beloved.'. | M | |
| 267 | Davy | Welsh | Diminutive of David: Beloved or friend, from the Hebrew. Sixth century St David (or Dewi) was patron saint of Wales. | M | |
| 268 | Davyn | Welsh | Variant of David 'beloved.'. | M | |
| 269 | Dee | Welsh | Dark. | F | |
| 270 | Delia | Welsh | Dark. | F | |
| 271 | Delwen | Welsh | Derived from the Welsh words for neat and fair. | F | |
| 272 | Delwin | Welsh | Godly friend. | M | |
| 273 | Delwyn | Welsh | Derived from the Welsh words for neat and fair. | F | |
| 274 | Delwyn | Welsh | Godly friend. | M | |
| 275 | Delyth | Welsh | Derived from the Welsh words for neat and pretty. | F | |
| 276 | Dera | Welsh | Fiend. | F | |
| 277 | Derwen | Welsh | From the oak tree. | F | |
| 278 | Deryn | Welsh | Bird. From the word 'aderyn'. | F | |
| 279 | Deverell | Welsh | From the river bank. | M | |
| 280 | Deverril | Welsh | From the river bank. | M | |