| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Matrona | - | Russian, Late Roman | ||
| Maura (1) | MOW-rah (Italian, Spanish) | Italian, Spanish, Late Roman | ||
| Mauritius | - | Late Roman | ||
| Maurus | - | Late Roman | ||
| Maxentius | - | Ancient Roman | ||
| Maxima | - | Ancient Roman | ||
| Maximianus | - | Ancient Roman | ||
| Maximiliana | - | Ancient Roman | ||
| Maximilianus | - | Ancient Roman | ||
| Maximinus | - | Ancient Roman | ||
| Maximus | - | Ancient Roman | ||
| Medraut | - | Welsh Mythology, Arthurian Romance | ||
| Medrod | - | Welsh Mythology, Arthurian Romance | ||
| Melania | me-LAHN-yah (Polish) | Italian, Spanish, Polish, Late Roman | ||
| Mercurius | - | Roman Mythology |