| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 421 | Lynne | Anglo-Saxon | A cascade. | F | |
| 422 | Mae | Anglo-Saxon | Kinswomen. | F | |
| 423 | Magan | Anglo-Saxon | Competent. | M | |
| 424 | Maida | Anglo-Saxon | Maiden. | F | |
| 425 | Mann | Anglo-Saxon | Vassal. | M | |
| 426 | Manton | Anglo-Saxon | From Mann's castle. | M | |
| 427 | Maponus | Anglo-Saxon | God of youth and music. | M | |
| 428 | Mars Leucetius | Anglo-Saxon | God worshipped at Bath. | M | |
| 429 | Maxwell | Anglo-Saxon | From Maccus's pool. | M | |
| 430 | May | Anglo-Saxon | Kinswomen. | F | |
| 431 | Mayda | Anglo-Saxon | Maiden. | F | |
| 432 | Meccus | Anglo-Saxon | Son of Gus. | M | |
| 433 | Megan | Anglo-Saxon | Strong and capable. | F | |
| 434 | Meghan | Anglo-Saxon | Strong and capable. | F | |
| 435 | Mercia | Anglo-Saxon | From Mercia. | F | |
| 436 | Merton | Anglo-Saxon | From the farm by the sea. | M | |
| 437 | Mildred | Anglo-Saxon | Gentle advisor. | F | |
| 438 | Modig | Anglo-Saxon | Brave. | M | |
| 439 | Moira | Anglo-Saxon | Bitter. | F | |
| 440 | Moire | Anglo-Saxon | Bitter. | F | |