| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 381 | Murray | Celtic | Lives by the sea. | M | |
| 382 | Murry | Celtic | Lives by the sea. | M | |
| 383 | Murtagh | Celtic | Protects the sea. | M | |
| 384 | Mynogan | Celtic | Mythical father of Beli. | M | |
| 385 | Naois | Celtic | Mythical warrior. | M | |
| 386 | Neal | Celtic | Champion. | M | |
| 387 | Neale | Celtic | Champion. | M | |
| 388 | Nealon | Celtic | Champion. | M | |
| 389 | Neese | Celtic | Choice. | M | |
| 390 | Neil | Celtic | Champion. | M | |
| 391 | Neill | Celtic | Champion. | M | |
| 392 | Nell | Celtic | Champion. | M | |
| 393 | Nels | Celtic | Chief. | M | |
| 394 | Nelson | Celtic | Son of Neil. | M | |
| 395 | Nemausus | Celtic | Mythical god of Nimes. | M | |
| 396 | Newlin | Celtic | From the new spring. | M | |
| 397 | Newlyn | Celtic | From the new spring. | M | |
| 398 | Niall | Celtic | Champion. | M | |
| 399 | Niallan | Celtic | Champion. | M | |
| 400 | Niece | Celtic | Choice. | M | |