| Mitzi | | MIT-see | German | |
| Miu | | mee-oo | Japanese | |
| Miyako | | mee-yah-ko | Japanese | |
| Miyu | | mee-yoo | Japanese | |
| Mizuki | | mee-zoo-kee | Japanese | |
| Mladen | | MLAH-den (Croatian, Serbian) | Croatian, Serbian, Slovene, Bulgarian, Macedonian | |
| Mladenka | | - | Croatian, Serbian | |
| Mnason | | - | Biblical, Biblical Latin, Biblical Greek, Ancient Greek | |
| Moana | | - | Maori, Hawaiian | |
| MochÁN | | - | Ancient Irish | |
| Modest | | - | Russian (Archaic) | |
| Modesta | | mo-DHE-stah (Spanish) | Spanish, Late Roman | |
| Modestas | | - | Lithuanian | |
| Modesto | | mo-DHE-sto (Spanish, Italian) | Spanish, Italian, Portuguese | |
| Modestus | | - | Late Roman | |