harry potter (the person) is related to harry potter (the book ) because harry potter the person is the main and most important character in harry potter (the book/movie)
JK Rowling knew a family named the Potter's as a child, and their little boy was called Harry. Later, while she was a train, Rowling remembered him and decided to name her main character after him.
Harry Potter was the wizard who ultimately defeated Lord Voldemort. Harry Potter, up to his eleventh birthday, was a small, thin orphan who lived with his uncle and aunt (of which were rude and mean...