| Magnus | | MAHNG-nus (Swedish), MAG-nəs (English) | Swedish, Norwegian, Danish, Late Roman | |
| Margarita | | mahr-gah-REE-tah (Spanish, Russian) | Spanish, Russian, Bulgarian, Lithuanian, Late Roman | |
| Matrona | | - | Russian, Late Roman | |
| Maura (1) | | MOW-rah (Italian, Spanish) | Italian, Spanish, Late Roman | |
| Mauritius | | - | Late Roman | |
| Maurus | | - | Late Roman | |
| Melania | | me-LAHN-yah (Polish) | Italian, Spanish, Polish, Late Roman | |
| Modesta | | mo-DHE-stah (Spanish) | Spanish, Late Roman | |
| Modestus | | - | Late Roman | |
| Monica | | MAHN-i-kə (English) | English, Italian, Portuguese, Romanian, Late Roman | |