Starting with letter M
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 21 | Mac a'bhaird | Gaelic | Son of Baird. | M | |
| 22 | Mac a'bhiadhtaiche | Gaelic | Son of Bhiadhtaiche. | M | |
| 23 | Mac Ailean | Gaelic | Son of the handsome man. | M | |
| 24 | Mac Alasdair | Gaelic | Son of Alasdair. | M | |
| 25 | Mac an Aba | Gaelic | Son of the Father or Abbott. | M | |
| 26 | Mac an Bharain | Gaelic | Son of the noble warrior. | M | |
| 27 | Mac an Bhreatannai | Gaelic | Son of the Briton. | M | |
| 28 | Mac Asgaill | Gaelic | Son of Asgaill. | M | |
| 29 | Mac Bheathain | Gaelic | Son of the man who lives by the clear stream. | M | |
| 30 | Mac Bhriain | Gaelic | Son of the strong. | M | |
| 31 | Mac Daraich | Gaelic | Son of the man from the ford by the oak trees. | M | |
| 32 | Mac GhiIle Easpuig | Gaelic | Son of the one who serves the sacred one. | M | |
| 33 | Mac Ghille Aindrei | Gaelic | Son of the one who served the manly one. | M | |
| 34 | Mac Ghille Bhuidhe | Gaelic | Son of the one who serves the blond one. | M | |
| 35 | Mac Ghille Dhuibh | Gaelic | Son of the one who serves the dark man. | M | |
| 36 | Mac Ghille Dhuinn | Gaelic | Son of the one who serves Brown. | M | |
| 37 | Mac Ghille Laider | Gaelic | Son of the one who serves the strong armed one. | M | |
| 38 | Mac Nair | Gaelic | Son of an heir. | M | |
| 39 | MacAlpin | Scottish | Son of Alpine. | M | |
| 40 | Macartan | Irish | Son of Artan. | M | |