| Mariano | | - | Italian, Spanish, Portuguese | |
| Mariazinha | | - | Portuguese | |
| Marika | | MAH-ree-kah (Finnish) | Czech, Slovak, Polish, Hungarian, Greek, Finnish, Estonian | |
| Mariko | | mah-ṙee-ko | Japanese | |
| Marina | | mah-REE-nah (Italian, Spanish, German, Russian), mə-REEN-ə (English) | Italian, Spanish, Portuguese, German, Swedish, Norwegian, Danish, Dutch, English, Greek, Russian, Uk | |
| Marinho | | - | Portuguese | |
| Marisa | | mah-REE-zah (Italian), mah-REE-sah (Spanish), mə-RIS-ə (English) | Italian, Spanish, Portuguese, English | |
| Maristela | | - | Spanish, Portuguese | |
| Marquinhos | | - | Portuguese | |
| Marta | | MAHR-tah (Spanish, Italian, Polish, Czech) | Spanish, Italian, Portuguese, Catalan, Polish, Czech, Slovak, German, Dutch, Romanian, Slovene, Bulg | |
| Martim | | - | Portuguese | |
| Martinho | | - | Portuguese | |
| Masami | | mah-sah-mee | Japanese | |
| Masaru | | mah-sah-ṙoo | Japanese | |
| Masuyo | | mah-soo-yo | Japanese | |