Starting with letter M
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 41 | Mac an Bhreatannai | Gaelic | Son of the Briton. | M | |
| 42 | Mac Artuir | Gaelic | Son of Arthur. | M | |
| 43 | Mac Asgaill | Gaelic | Son of Asgaill. | M | |
| 44 | Mac Bheathain | Gaelic | Son of the man who lives by the clear stream. | M | |
| 45 | Mac Bhriain | Gaelic | Son of the strong. | M | |
| 46 | Mac Daraich | Gaelic | Son of the man from the ford by the oak trees. | M | |
| 47 | Mac GhiIle Easpuig | Gaelic | Son of the one who serves the sacred one. | M | |
| 48 | Mac Ghille Aindrei | Gaelic | Son of the one who served the manly one. | M | |
| 49 | Mac Ghille Bhuidhe | Gaelic | Son of the one who serves the blond one. | M | |
| 50 | Mac Ghille Dhuibh | Gaelic | Son of the one who serves the dark man. | M | |
| 51 | Mac Ghille Dhuinn | Gaelic | Son of the one who serves Brown. | M | |
| 52 | Mac Ghille Laider | Gaelic | Son of the one who serves the strong armed one. | M | |
| 53 | Mac Ghille Mhichei | Gaelic | Son of the one who served Saint Michael. | M | |
| 54 | Mac Nair | Gaelic | Son of an heir. | M | |
| 55 | MacAdam | Gaelic | Son of Adam. | M | |
| 56 | MacAdhaimh | Gaelic | Son of Adam. | M | |
| 57 | MacAdhamh | Scottish | Son of Adam. | M | |
| 58 | MacAilean | Gaelic | Son of the handsome man. | M | |
| 59 | Macaire | Greek | Blessed. | M | |
| 60 | MacAladair | Gaelic | Son of Alasdair. | M | |