| 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 | |
| Milo | | MIE-lo (English) | English, Ancient Germanic | |
| 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 | |
| Neophytos | | - | Ancient Greek | |
| Nereus | | NEER-oos (English), NEER-ee-əs (English) | Greek Mythology, Ancient Greek, Biblical, Biblical Latin, Biblical Greek | |
| Nicanor | | - | Ancient Greek (Latinized) | |
| Nicolaus | | NEE-ko-lows (German) | German, Ancient Greek (Latinized) | |