| MC | Melanie Cavill | fictional character from Snowpiercer |
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Melanie Klein | British Austrian born psychoanalyst (1882–1960) |
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Melanie Safka | American musician (1947–2024) |
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Melinda Gates | American philanthropist |
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Melinda Gebbie | American comics artist and writer |
| M | Meliodas | fictional character from The Seven Deadly Sins |
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Melissa Bonny | Swiss singer |
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Melissa McCarthy | American actress and comedian |
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Melissandre Fuentes | figure skater |
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Melvil Dewey | American librarian (1851–1931) |
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Menachem Mendel Schneerson | Russian-American Orthodox Jewish rabbi (1902–1994) |
| M | Menchi | fictional character from Hunter × Hunter |
| MS | Mendel Steedly | fictional character from Lust Epidemic |
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Mensa International | high IQ society |
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Mənsur | |
| M | Meowth | fictional character from Pokémon |
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Mephisto | fictional character from Silver Surfer |
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Mephistopheles | |
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Merida | fictional character from Brave |
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Merkules | Canadian rapper, songwriter |
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Merle Haggard | American country music songwriter, singer, and musician (1937–2016) |
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Merlin | fictional character from Arthurian romance |
| M | Merlin | fictional character from The Sword in the Stone |
| M | Mermista | fictional character from She-Ra and the Princesses of Power |
| MN | Merry Nigthmare | fictional character from Dream Eater Merry |
| MP | Mervyn Peake | English author and illustrator (1911–1968) |
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Mesut Özil | Turkish-German association football player |
| M | Meta | a district in Ethiopia |
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Metallica | American heavy metal band |
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metaphor | figure of speech in which one thing is asserted to be another when it is in fact not so, based on properties of the latter that apply to the former, pointing to similarity |
| M | Metatron | archangel in Judaism |
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methamphetamine | central nervous system stimulant |
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Method Man | American rapper and actor (born 1971) |
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Metis | |
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Meyer Lansky | American gangster |
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Mia Khalifa | Lebanese-American former pornographic film actress (born 1993) |
| MS | Mia Sara | American actress |
| MT | Mia Thermopolis | fictional character from The Princess Diaries |
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Michaela Coel | British actress and screenwriter |
| MA | Michael Afton | fictional character from Five Nights at Freddy's: Sister Location |
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Michaela Kaniber | German politician |
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Michael Aranda | musician |
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Michael Avenatti | American attorney |
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Michael Ballack | German association football player (born 1976) |
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Michael Barlow | Australian footballer |
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Michael Barrymore | Comedian, actor, television presenter, broadcaster |
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Michael Brooks | Progressive American talk show host (1983–2020) |
| MB | Michael Bruner | American reality television participant |
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Michael "Bully" Herbig | German comedian and actor (born 1968) |
| MB | Michael Burns | English footballer (born 1988) |