Actors/Actresses:
* Robert De Niro: Legendary American actor
* Ryan Gosling: Canadian actor known for his roles in "La La Land" and "Blade Runner 2049"
* Reese Witherspoon: American actress known for her roles in "Legally Blonde" and "Walk the Line"
* Rachel McAdams: Canadian actress known for her roles in "The Notebook" and "Spotlight"
* Robert Downey Jr.: American actor known for his role as Iron Man in the Marvel Cinematic Universe
* Robin Williams: (deceased) American actor and comedian known for his roles in "Mrs. Doubtfire" and "Good Will Hunting"
* Rupert Grint: British actor known for his role as Ron Weasley in the "Harry Potter" film series
Musicians:
* Rihanna: Barbadian singer, songwriter, and businesswoman
* Ringo Starr: British drummer for the Beatles
* Roger Waters: British musician and songwriter, co-founder of Pink Floyd
* R. Kelly: American singer, songwriter, and record producer
* R.E.M.: American rock band
Athletes:
* Roger Federer: Swiss professional tennis player
* Rafael Nadal: Spanish professional tennis player
* Russell Westbrook: American professional basketball player
* Reggie Miller: American former professional basketball player
* Ronnie O'Sullivan: English professional snooker player
Politicians:
* Ronald Reagan: Former President of the United States
* Richard Nixon: Former President of the United States
* Ruth Bader Ginsburg: (deceased) Associate Justice of the Supreme Court of the United States
* Robert F. Kennedy: (deceased) Former Attorney General of the United States
Writers:
* Roald Dahl: British author known for his children's books like "Charlie and the Chocolate Factory"
* Rudyard Kipling: British author known for "The Jungle Book"
* Rebecca Solnit: American writer and activist
Other:
* Ralph Lauren: American fashion designer
* Richard Branson: British entrepreneur and founder of Virgin Group
* Rupert Murdoch: Australian-American media mogul
This is just a small sample of famous people with first names starting with R. There are many more out there!