Actors/Actresses:
* Meryl Streep
* Matt Damon
* Michelle Pfeiffer
* Morgan Freeman
* Marlon Brando
* Marilyn Monroe
* Mark Wahlberg
* Maggie Smith
* Martin Sheen
* Michael Caine
* Michelle Yeoh
* Margot Robbie
Musicians:
* Madonna
* Michael Jackson
* Mariah Carey
* Metallica
* Mozart
* Marvin Gaye
* Mick Jagger
* Miley Cyrus
* Maroon 5
* Michael Bublé
Authors:
* Mark Twain
* Maya Angelou
* Margaret Atwood
* Milan Kundera
* Mary Shelley
* Malcolm Gladwell
Politicians:
* Martin Luther King Jr.
* Malcolm X
* Margaret Thatcher
* Michelle Obama
Other:
* Marie Curie (Scientist)
* Muhammad Ali (Boxer)
* Marilyn vos Savant (Columnist)
* Michelangelo (Artist)
* Marie Antoinette (Queen)
This is just a small sample of famous people with last names starting with "M". There are many more depending on the field you're interested in!