| Name | # Entries |
|---|---|
| Mac Larn | 9 |
| Mac Latchy | 6 |
| Mac Laughlan Weir | 0 |
| Mac Le | 4 |
| Maclean | 682 |
| Monachetti | 1 |
| Monaci | 5 |
| Momtazi | 2 |
| Monacella | 9 |
| Monacello | 1 |
| Mainard | 19 |
| Mainardi | 2 |
| Mainella | 6 |
| Maindok | 6 |
| Maulitz | 1 |
| Mauldin | 0 |
| Maule Oliver | 1 |
| Maumovski | 3 |
| Mc Brinn | 1 |
| Mc Burnie | 85 |
| Murko | 6 |
| Murland | 1 |
| Murmane | 1 |
| Murmylo | 1 |
| Maioli | 1 |
| Maiola | 1 |
| Maiorana | 78 |
| Mc Crae | 129 |
| Mc Crain | 0 |
| Mc Craith | 10 |
| Mc Craken | 4 |
| Mc Crane | 2 |
| Mc Crath | 3 |
| Mccran | 1 |
| Mc Crawleigh | 1 |
| Marlu | 3 |
| Marm | 8 |
| Marmagelos | 1 |
| Marmal | 1 |
| Marman | 3 |
| Mascetta | 4 |
| Mascazzini | 1 |
| Maschauer | 1 |
| Masche | 1 |
| Maschio | 8 |
| Maschler | 4 |
| Maschmann | 1 |
| Mascini | 5 |
| Maschwitz | 1 |
| Masciulli | 10 |
| Mascoll | 6 |
| Mascolo | 14 |
| Masciadri | 1 |
| Mc Maken | 0 |
| Mc Manamny | 14 |
| Mc Manaway | 4 |
| Mc Manis | 22 |
| Mc Mann | 7 |
| Morton | 1967 |
| Morton Brown | 0 |
| Mortyne | 5 |
| Morton Galway | 0 |
| Morton King | 0 |
| Morvinson | 2 |
| Morweiser | 1 |
| Morwitch | 4 |
| Morynko | 1 |
| Morzent | 1 |
| Morzone | 15 |
| Mosa | 5 |
| Mosari | 1 |
| Mosavi | 5 |
| Mosawi | 3 |
| Mosbacher | 2 |
| Mosaad | 5 |