Blackwell is a surname that has been used by several notable people throughout history. Otis Blackwell was an American songwriter and singer who wrote over 500 songs, including 'Great Balls of Fire' and 'DON't Be Cruel'. Ewell Blackwell was an American professional baseball pitcher who played for the Cincinnati Reds from 1946 to 1955. EARL Blackwell was an American publicist and author who wrote the book Celebrity Register.