The director known for spaghetti westerns is Sergio Leone, a five-letter name. Leone was an Italian film director and screenwriter who is best known for his work in the Spaghetti Western genre. He directed some of the most influential films of the genre, including 'A Fistful of Dollars' (1964), 'For a Few Dollars More' (1965), and 'The Good, the Bad and the Ugly' (1966). Leone's films are noted for their moral ambiguity, dark humor, and epic cinematography.