Rex Harrison. Actor: My Fair Lady. Rex Harrison was born Reginald Carey Harrison in Huyton, Lancashire, England, to Edith Mary (Carey) and William Reginald Harrison, a cotton broker. He changed his name to Rex as a young boy, knowing it was the Latin word for "King". Starting out on his theater career at age 18, his first job at the Liverpool Rep Theatre was nearly his last - dashing across.