| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 501 | MacQuarrie | Scottish | Son of the proud. | M | |
| 502 | MacQueen | Scottish | Son of the good man. | M | |
| 503 | MacRae | Scottish | Son of grace. | M | |
| 504 | MacRay | Scottish | Son of grace. | M | |
| 505 | Madntyre | Scottish | Son of the carpenter. | M | |
| 506 | MaeAdam | Scottish | Son of Adam. | M | |
| 507 | Makolm | Scottish | Follower of Saint Columba. | M | |
| 508 | Malcolm | Scottish | St. Columb's disciple. | M | |
| 509 | Malcom | Scottish | St. Columb's disciple. | M | |
| 510 | Maolmuire | Scottish | Dark skinned. | M | |
| 511 | Marcas | Scottish | Of Mars. The Roman fertility god Mars for whom March was named. | M | |
| 512 | Math | Scottish | Bear. | M | |
| 513 | Mathe | Scottish | Bear. | M | |
| 514 | Matheson | Scottish | Bear's son. | M | |
| 515 | Max | Scottish | Diminutive of Maxwell: Magnus' spring. Mac's well. Surname and place name. | M | |
| 516 | Maxwell | Scottish | Magnus' spring. Mac's well. Surname and place name. | M | |
| 517 | McCloud | Scottish | Son of the ugly man. | M | |
| 518 | Mealcoluim | Scottish | Follower of Saint Columba. | M | |
| 519 | Melville | Scottish | A Scottish surname based on a French place name. | M | |
| 520 | Menzies | Scottish | From Mesniers. | M | |