| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 1921 | Maxine | English | The greatest. Feminine of Max. | F | |
| 1922 | May | English | Month name. | F | |
| 1923 | Mayda | English | Maiden. | F | |
| 1924 | Mayde | English | Maiden. | F | |
| 1925 | Mayme | English | Abbreviation of Mary and Miriam. | F | |
| 1926 | Melinda | English | Blend of Melissa and Linda. | F | |
| 1927 | Melodie | English | Variant of Melody: Melody (song). | F | |
| 1928 | Melody | English | Melody (song). | F | |
| 1929 | Melva | English | Feminine of Melvin. | F | |
| 1930 | Melvina | English | Feminine of Melvin. | F | |
| 1931 | Melynda | English | Blend of Melissa and Linda. | F | |
| 1932 | Mercer | English | Merchant. | F | |
| 1933 | Mercia | English | People of the borderland. From Mercia. Compassion; forbearance. | F | |
| 1934 | Mercie | English | Compassion; forbearance. | F | |
| 1935 | Mercilla | English | Compassion; forbearance. | F | |
| 1936 | Mercina | English | Compassion; forbearance. | F | |
| 1937 | Mercy | English | Mercy. Merciful. | F | |
| 1938 | Meri | English | Mirthful; joyous. Also an abbreviation of Meredith. | F | |
| 1939 | Meridel | English | Mirthful; joyous. Also an abbreviation of Meredith. | F | |
| 1940 | Meriel | English | Variant of Muriel, meaning shining sea. | F | |