| Marvyn | | MAHR-vin | English (Rare) | |
| Mary | | MER-ee (English), MAR-ee (English) | English, Biblical | |
| Maryann | | mer-ee-AN, mar-ee-AN | English | |
| Maryanne | | mer-ee-AN, mar-ee-AN | English | |
| Marybeth | | mer-ee-BETH, mar-ee-BETH | English | |
| Marylou | | mer-ee-LOO, mar-ee-LOO | English | |
| Marylu | | mer-ee-LOO, mar-ee-LOO | English (Rare) | |
| Marylyn | | - | English | |
| Mason | | MAY-sən | English | |
| Masterman | | MAS-tər-mən | English (Rare) | |
| Mat | | MAT | English | |
| Mathew | | MATH-yoo | English | |
| Mathilda | | mə-TIL-də (English, Swedish) | English, Swedish, Ancient Germanic | |
| Matilda | | mə-TIL-də (English), MAH-teel-dah (Finnish) | English, Swedish, Finnish | |
| Matt | | MAT | English | |