| Marios | | - | Greek | |
| Markos | | - | Greek, Ancient Greek, Biblical Greek | |
| Martha | | MAHR-thə (English) | English, Swedish, Norwegian, Danish, Dutch, German, Greek, Biblical, Old Church Slavic, Biblical Lat | |
| Matthaios | | - | Biblical Greek | |
| Matthan | | - | Biblical, Biblical Latin, Biblical Greek | |
| Matthias | | mah-TEE-ahs (German), mə-THIE-əs (English) | Greek, German, Swedish, Norwegian, Danish, French, Dutch, Biblical, Biblical Latin, Biblical Greek | |
| Medea | | mə-DEE-ə (English) | Greek Mythology (Latinized), Georgian | |
| Medeia | | - | Greek Mythology | |
| Medousa | | - | Greek Mythology | |
| Medusa | | mə-DOO-sə (English) | Greek Mythology (Latinized) | |
| Megaera | | - | Greek Mythology (Latinized) | |
| Megaira | | - | Greek Mythology | |
| Melaina | | - | Greek Mythology | |
| Melanthios | | - | Greek Mythology, Ancient Greek | |
| Melchol | | - | Biblical Greek | |