| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 521 | Micheal | Scottish | Form of Michael 'Who is like God?'. | M | |
| 522 | Mitch | Scottish | Form of Michael 'Who is like God?'. | M | |
| 523 | Mitchel | Scottish | Form of Michael 'Who is like God?'. | M | |
| 524 | Mitchell | Scottish | Form of Michael 'Who is like God?'. | M | |
| 525 | Moncreiffe | Scottish | From the hill of the sacred bough. | M | |
| 526 | Monroe | Scottish | From the river's mouth. | M | |
| 527 | Montgomery | Scottish | From Montgomerie. | M | |
| 528 | Moray | Scottish | Variant of Murray: Sea. A Scottish surname and place name. | M | |
| 529 | Morogh | Scottish | Man of the sea. | M | |
| 530 | Morrison | Scottish | Son of the servant of Mary. | M | |
| 531 | Mufidy | Scottish | Man of the sea. | M | |
| 532 | Muir | Scottish | From the moor. | M | |
| 533 | Muirfinn | Scottish | DweIls near the beautiful sea. | M | |
| 534 | Munro | Scottish | Man from Ro. | M | |
| 535 | Munroe | Scottish | Man from Ro. | M | |
| 536 | Murdoc | Scottish | Protector of the sea. | M | |
| 537 | Murdoch | Scottish | Protector of the sea. | M | |
| 538 | Murdock | Scottish | Protector of the sea. | M | |
| 539 | Murray | Scottish | From the sea. Ancient Scottish clan surname. | M | |
| 540 | Nab | Scottish | Abbot. | M | |