Actors/Actresses:
* Jason Alexander: (born in Newark) - Famous for his role as George Costanza on "Seinfeld"
* Jason Bateman: (born in Rye, NY but raised in New Jersey) - Known for his roles in "Arrested Development", "Ozark", and "Juno"
* Jennifer Coolidge: (born in Boston, MA but raised in New Jersey) - Famous for her roles in "Legally Blonde", "2 Broke Girls", and "The White Lotus"
* Jonathan Groff: (born in Lancaster, PA but raised in New Jersey) - Known for his roles in "Hamilton", "Looking", and "Mindhunter"
* Jon Stewart: (born in New York City but raised in New Jersey) - Comedian and former host of "The Daily Show"
Athletes:
* Jason Kidd: (born in San Francisco, CA but played for the New Jersey Nets) - Former NBA Hall of Fame point guard
* Joe Namath: (born in Beaver Falls, PA but raised in New Jersey) - Former NFL quarterback, known for his time with the New York Jets
* Jackie Robinson: (born in Cairo, GA but played for the Brooklyn Dodgers) - First African American player in Major League Baseball
* Jenny Finch: (born in La Mirada, CA but played for the New Jersey Devils) - Former professional ice hockey player
Music:
* Jon Bon Jovi: (born in New Jersey) - Lead singer of the rock band Bon Jovi
* Journey: (formed in San Francisco, CA but had a strong presence in New Jersey) - Rock band known for hits like "Don't Stop Believin'"
Other:
* James Gandolfini: (born in Westwood, NJ) - Actor known for his role as Tony Soprano in "The Sopranos"
* Jon Stewart: (born in New York City but raised in New Jersey) - Comedian and former host of "The Daily Show"
* Jay-Z: (born in Brooklyn, NY but raised in New Jersey) - Rapper, songwriter, and entrepreneur
This is just a small sampling of the many famous people from New Jersey starting with the letter "J". New Jersey has a rich history and has produced many talented individuals in various fields.