| Maryana | | - | Russian | |
| Masha | | - | Russian | |
| Matfey | | maht-VYAY | Russian | |
| Matrona | | - | Russian, Late Roman | |
| Matryona | | - | Russian | |
| Matvei | | maht-VYAY | Russian | |
| Matvey | | maht-VYAY | Russian | |
| Maxim | | mahk-SEEM (Russian) | Russian, Ukrainian, Belarusian | |
| Mechislav | | - | Russian (Rare), Medieval Slavic | |
| Mefodiy | | - | Russian (Archaic) | |
| Melor | | - | Russian | |
| Michail | | - | Greek, Russian | |
| Mikhail | | mee-khah-EEL (Russian) | Russian, Bulgarian | |
| Mila | | - | Russian, Ukrainian, Bulgarian, Czech, Serbian, Croatian, Macedonian | |
| Milan | | MEE-lahn (Czech) | Czech, Slovak, Russian, Serbian, Croatian, Slovene, Bulgarian, Macedonian, Dutch | |