| Markos | | - | Greek, Ancient Greek, Biblical Greek | |
| Melanthios | | - | Greek Mythology, Ancient Greek | |
| Melissa | | mə-LIS-ə (English) | English, Dutch, Ancient Greek, Greek Mythology | |
| Meliton | | - | Ancient Greek, Georgian | |
| Melitta | | me-LI-tah (German) | Ancient Greek, German | |
| Menodora | | - | Ancient Greek | |
| Methodios | | - | Ancient Greek | |
| Methodius | | mə-THO-dee-əs (English) | Ancient Greek (Latinized) | |
| Metrodora | | - | Ancient Greek | |
| Metrophanes | | - | Ancient Greek | |
| Miltiades | | - | Ancient Greek | |
| Mnason | | - | Biblical, Biblical Latin, Biblical Greek, Ancient Greek | |
| Myron | | MIE-rən (English), muy-rawn (Ancient Greek) | English, Ancient Greek | |
| Myrrine | | - | Ancient Greek | |