| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Maia (3) | - | Basque | ||
| Maialen | - | Basque | ||
| Maite (2) | - | Basque | ||
| Markel | - | Basque | ||
| Marko | MAHR-ko (Finnish) | Ukrainian, Croatian, Serbian, Slovene, Bulgarian, Macedonian, Finnish, Basque | ||
| Martzel | - | Basque | ||
| Matia | - | Basque | ||
| Mattin | - | Basque | ||
| Matxin | - | Basque | ||
| Mikel | - | Basque | ||
| Mintxo | - | Basque | ||
| Miren | - | Basque | ||
| Mitxel | - | Basque |