| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 1341 | Mairead | Irish | Name of a saint. | F | |
| 1342 | Mairia | Irish | Bitter. | F | |
| 1343 | Mairona | Irish | Bitter. | F | |
| 1344 | Maiti | Irish | Strong battle maiden. | F | |
| 1345 | Maitilda | Irish | Strong battle maiden. | F | |
| 1346 | Maitilde | Irish | Strong battle maiden. | F | |
| 1347 | Majella | Irish | Name of a saint. | F | |
| 1348 | Mal | Irish | Chief. | M | |
| 1349 | Malachy | Irish | Servant. | M | |
| 1350 | Malloy | Irish | Noble chief. | M | |
| 1351 | Malone | Irish | Serves Saint John. Surname. | M | |
| 1352 | Maloney | Irish | Serves Saint John. | M | |
| 1353 | Malvin | Irish | Chief. | M | |
| 1354 | Malvina | Irish | Sweet. | F | |
| 1355 | Mane | Irish | Great. | M | |
| 1356 | Mannix | Irish | Monk. | M | |
| 1357 | Mannuss | Irish | Great. | M | |
| 1358 | Manus | Irish | Surname. | M | |
| 1359 | Maola | Irish | Handmaiden. | F | |
| 1360 | Maoli | Irish | Handmaiden. | F | |