| Maximino | | mahk-see-MEE-no (Spanish) | Spanish, Portuguese | |
| Micaela | | - | Italian, Spanish, Portuguese | |
| Miguel | | mee-GEL | Spanish, Portuguese | |
| Miguela | | - | Spanish, Portuguese | |
| Miguelito | | - | Spanish, Portuguese | |
| Modesto | | mo-DHE-sto (Spanish, Italian) | Spanish, Italian, Portuguese | |
| Moema | | - | Portuguese (Brazilian) | |
| MoisÉS | | moi-SES (Spanish) | Spanish, Portuguese | |
| Monica | | MAHN-i-kə (English) | English, Italian, Portuguese, Romanian, Late Roman | |
| NÚRia | | - | Catalan, Portuguese | |
| Narcisa | | - | Portuguese, Spanish, Italian, Romanian | |
| Narciso | | nahr-CHEE-so (Italian), nahr-THEE-so (Spanish), nahr-SEE-so (Latin American Spanish) | Italian, Spanish, Portuguese | |
| NatÁLia | | - | Hungarian, Portuguese, Slovak | |
| Natacha | | - | French, Portuguese | |
| Natanael | | - | Spanish, Portuguese | |