| Name | Meaning | Details |
|---|---|---|
| Mallison | Son Of Mary | View Details |
| Mancuso | Left-handed | View Details |
| Manus | Great/Army Man | View Details |
| March | Month Of March Or Walk In Unison | View Details |
| Maro | Myself | 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 |
| Mayra | Combination Of Maya/Myra/Mara | 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 |
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