| Menodora | | - | Ancient Greek | |
| Methodios | | - | Ancient Greek | |
| Methodius | | mə-THO-dee-əs (English) | Ancient Greek (Latinized) | |
| Metrodora | | - | Ancient Greek | |
| Metrophanes | | - | Ancient Greek | |
| Milo | | MIE-lo (English) | English, Ancient Germanic | |
| Miltiades | | - | Ancient Greek | |
| Mithradatha | | - | Ancient Persian | |
| Mithridates | | - | Ancient Persian (Hellenized) | |
| Mnason | | - | Biblical, Biblical Latin, Biblical Greek, Ancient Greek | |
| MochÁN | | - | Ancient Irish | |
| Morcant | | - | Ancient Celtic | |
| MyrgjÖL | | - | Ancient Scandinavian | |
| Myron | | MIE-rən (English), muy-rawn (Ancient Greek) | English, Ancient Greek | |
| Myrrine | | - | Ancient Greek | |