| Mercury | | MURK-yə-ree (English) | Roman Mythology (Anglicized) | |
| Merlin | | MUR-lin (English) | Arthurian Romance, English | |
| MihĂIȚĂ | | - | Romanian | |
| Mihaela | | mee-hah-YE-lah (Romanian), mee-HAH-el-ah (Croatian) | Romanian, Slovene, Croatian, Macedonian | |
| Mihai | | - | Romanian | |
| Mihail | | - | Romanian, Bulgarian, Macedonian, Greek | |
| Minerva | | mi-NUR-və (English) | Roman Mythology, English | |
| Minodora | | - | Romanian | |
| Mircea | | - | Romanian | |
| Mirela | | - | Romanian, Croatian | |
| Miron (1) | | MEE-rawn (Polish) | Romanian, Russian, Ukrainian, Polish | |
| Miruna | | - | Romanian | |
| Mitica | | - | Romanian | |
| Modesta | | mo-DHE-stah (Spanish) | Spanish, Late Roman | |
| Modestus | | - | Late Roman | |