| Name | Meaning | Details |
|---|---|---|
| Mallison | Son Of Mary | View Details |
| March | Month Of March Or Walk In Unison | View Details |
| Marquez | Son Of Marco | View Details |
| Mather | Person Who Mows | View Details |
| Mattox | Son Of Madoc | View Details |
| Mavis | Song Thrush | View Details |
| Maxon | Son Of Max (The Greatest) | View Details |
| McCall | Son Of The Battle Chief | View Details |
| McClure | "Son Of Ordars Follower" | View Details |
| McCormick | Son Of Cormac | View Details |
| McCoy | Son Of Aodh | View Details |
| McCullough | Son Of The Brave | View Details |
| McDaniel | Son Of Daniel/Donald | View Details |
| McDonald | Son Of Donald | View Details |
| McDowell | Son Of The Dark One | View Details |
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