Actors:
* Colin Firth (1960) - English actor, known for his roles in "Pride & Prejudice," "The King's Speech," and "Bridget Jones's Diary."
* Sigourney Weaver (1949) - American actress, famous for her role as Ellen Ripley in the "Alien" franchise.
* Mark Hamill (1951) - American actor, best known for playing Luke Skywalker in the "Star Wars" saga.
* Sean Bean (1959) - English actor, known for his roles in "Game of Thrones," "Lord of the Rings," and "GoldenEye."
* Matt Damon (1970) - American actor, known for his roles in "Good Will Hunting," "The Bourne Identity," and "Saving Private Ryan."
* Kate Winslet (1975) - English actress, known for her roles in "Titanic," "Revolutionary Road," and "The Reader."
* Jessica Biel (1982) - American actress, known for her roles in "7th Heaven" and "The Sinner."
* Jesse Tyler Ferguson (1975) - American actor, known for his role as Mitchell Pritchett in "Modern Family."
* David Schwimmer (1966) - American actor, known for his role as Ross Geller in "Friends."
Musicians:
* John Mayer (1977) - American singer-songwriter and guitarist.
* Jason Derulo (1989) - American singer-songwriter and dancer.
* Billy Joel (1949) - American singer-songwriter and pianist.
Athletes:
* Tom Brady (1977) - American football quarterback, known for his success with the New England Patriots and Tampa Bay Buccaneers.
* Alex Rodriguez (1975) - Former American baseball player.
Other:
* Carmen Sandiego (Fictional Character) - Protagonist of the popular educational video game and television series.
* Kevin Spacey (1959) - American actor and producer, known for his roles in "House of Cards" and "The Usual Suspects."
* Chevy Chase (1943) - American actor and comedian, known for his work on "Saturday Night Live" and "National Lampoon's Vacation."
This is not an exhaustive list, but it includes some of the most well-known celebrities born on October 8th.