| Mateus | | - | Portuguese | |
| Matheus | | - | Portuguese (Brazilian) | |
| Matias | | MAH-tee-ahs (Finnish) | Finnish, Portuguese | |
| Matilde | | mah-TEEL-de (Spanish) | Spanish, Portuguese, Italian | |
| Maui | | - | Hawaiian, Polynesian Mythology | |
| MaurÍCio | | mow-REE-syoo | Portuguese | |
| Mauro | | MOW-ro (Italian) | Italian, Portuguese (Brazilian) | |
| Mawar | | - | Indonesian, Malay | |
| Maximiano | | mahk-see-MYAH-no (Spanish) | Spanish, Portuguese | |
| Maximiliano | | mahk-see-mee-LYAH-no (Spanish) | Spanish, Portuguese | |
| Maximino | | mahk-see-MEE-no (Spanish) | Spanish, Portuguese | |
| Mayu | | mah-yoo | Japanese | |
| Mega | | ME-gah | Indonesian | |
| Megumi | | me-goo-mee | Japanese | |
| Mei (1) | | - | Chinese | |