Starting with letter M
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 141 | MacNab | Gaelic | Son of the Father or Abbott. | M | |
| 142 | MacNab | Scottish | Son of the Abbot. | M | |
| 143 | MacNachtan | Scottish | Son of the pure one. | M | |
| 144 | MacNaughton | Scottish | Son of the pure one. | M | |
| 145 | MacNeill | Scottish | Son of the champion. | M | |
| 146 | MacNiall | Scottish | Son of the champion. | M | |
| 147 | MacNicol | Scottish | Son of the conquering people. | M | |
| 148 | MacPherson | Scottish | Son of the parson. | M | |
| 149 | MacQuaid | Irish | Son of Quaid. | M | |
| 150 | MacQuarrie | Scottish | Son of the proud. | M | |
| 151 | MacQueen | Scottish | Son of the good man. | M | |
| 152 | MacRae | Scottish | Son of grace. | M | |
| 153 | MacRay | Scottish | Son of grace. | M | |
| 154 | Madai | Biblical | A measure, judging, a garment. | M | |
| 155 | Madawc | Welsh | Beneficent. | M | |
| 156 | Madawg | Welsh | Legendary son of Teithyon. | M | |
| 157 | Madden | Irish | Smalldog Milos. | M | |
| 158 | Maddoc | Welsh | Beneficent. | M | |
| 159 | Maddock | Celtic | Beneficent. | M | |
| 160 | Maddock | Welsh | Beneficent. | M | |