What if his name is Butler?

You probably have noticed that butlers are called by their surnames. When the mistress of the house calls for him, he is Simpson or Hawkins or whatever. However, on one episode of Fibber McGee and Molly, they encounter Mayor LaTrivia's butler Crevis, and ask him about his unusual name. He informs them that that is not his real name. His name is actually Butler, but that somehow just did not seem to work in his occupation. Faversham the butler sounds just right, but Butler the butler does not make it.