The first name of Harry Potter's red-haired best friend is Ron.
Ron Weasley is a fictional character in J.K. Rowling's Harry Potter series. He is the oldest son of Arthur and Molly Weasley, and the brother of Bill, Charlie, Percy, Ginny, George, and the late Fred Weasley. He is best friends with Harry Potter and is a member of Dumbledore's Army. Ron is a brave and loyal friend, and often provides comic relief in the series.