| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 381 | CuUladh | Irish | Hound of Ulster. | M | |
| 382 | Cuyler | Irish | Chapel. | M | |
| 383 | Daeg | Irish | Black-haired. | M | |
| 384 | Daegan | Irish | Black-haired. | M | |
| 385 | Dagen | Irish | Black-haired. | M | |
| 386 | Dahy | Irish | Capable; quick and agile. | M | |
| 387 | Daibheid | Irish | Dearly loved. | M | |
| 388 | Daibhid | Irish | Variant of Daibhidh: Beloved. | M | |
| 389 | Daibhidh | Irish | Beloved. | M | |
| 390 | Dailey | Irish | Variant of Daly: Gather together. | M | |
| 391 | Daimhin | Irish | Bard. | M | |
| 392 | Daire | Irish | Wealthy. | M | |
| 393 | Daith | Irish | Diminutive of Daibhidh: Beloved. | M | |
| 394 | Daithi | Irish | Beloved or quick and agile. | M | |
| 395 | Daithm | Irish | Variant of Daibhidh: Beloved. | M | |
| 396 | Dal | Irish | Variant of Dallin 'blind.'. | M | |
| 397 | Dalan | Irish | Variant of Dallin 'blind.'. | M | |
| 398 | Daley | Irish | Variant of Daly: Gather together. | M | |
| 399 | Dallan | Irish | Blind. | M | |
| 400 | Dallen | Irish | Variant of Dallin 'blind.'. | M | |