| Luiza | | luw-EE-zah (Polish) | Polish, Portuguese, Romanian | |
| Lurdes | | - | Portuguese | |
| Luzia | | - | Portuguese, German | |
| Lygia | | - | Portuguese (Brazilian) | |
| MÁRcia | | - | Portuguese | |
| MÁRcio | | - | Portuguese | |
| MÁRio | | - | Portuguese | |
| MÔNica | | - | Portuguese | |
| Madalena | | mə-də-LE-nə | Portuguese | |
| Mafalda | | mah-FAHL-dah (Italian), mə-FAL-də (Portuguese) | Italian, Portuguese | |
| Magda | | MAHK-dah (German), MAHKH-dah (Dutch), MAHG-dah (Polish) | German, Dutch, Swedish, Norwegian, Danish, Czech, Polish, Croatian, Romanian, Portuguese | |
| Maia (1) | | MAY-ə (English), MIE-ə (English) | Greek Mythology, Roman Mythology, Portuguese, Georgian | |
| Manoel | | - | Portuguese (Brazilian) | |
| Manoela | | - | Portuguese (Brazilian) | |
| Manuel | | mah-NWEL (Spanish), man-oo-EL (Portuguese), MAHN-oo-el (German) | Spanish, Portuguese, German, English, Italian, French, Romanian, Late Greek (Latinized) | |