| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 861 | Mad\uley | Irish | Son of Olaf. | M | |
| 862 | Maeleachlainn | Irish | Servant. | M | |
| 863 | Maelisa | Irish | Serves Christ. | M | |
| 864 | Magee | Irish | Surname. | M | |
| 865 | Mago | Irish | Great. | M | |
| 866 | Maher | Irish | Generous. | M | |
| 867 | Mahon | Irish | Bear. | M | |
| 868 | Mahoney | Irish | Surname. | M | |
| 869 | Mainchin | Irish | Monk. | M | |
| 870 | Mal | Irish | Chief. | M | |
| 871 | Malachy | Irish | Servant. | M | |
| 872 | Malloy | Irish | Noble chief. | M | |
| 873 | Malone | Irish | Serves Saint John. Surname. | M | |
| 874 | Maloney | Irish | Serves Saint John. | M | |
| 875 | Malvin | Irish | Chief. | M | |
| 876 | Mane | Irish | Great. | M | |
| 877 | Mannix | Irish | Monk. | M | |
| 878 | Mannuss | Irish | Great. | M | |
| 879 | Manus | Irish | Surname. | M | |
| 880 | Maolruadhan | Irish | Serves Saint Ruadhan. | M | |