This site is addictive. You know, of course that Mr. Crapper was a man who made toilets -- in England I believe -- and being proud of his work he put his name on the product and so came into use the phrase :"Where is the Crapper" meaning "Where is the toilet." Lacking legal eagles dedicated to preserving proprietary names for thier clients the name came into common use and Crapper became toilet and vice versa.
As to other name changes, an acquaintance of mine changed his last name to April from the Italian Fiacaprile to save his daughter the inevitable slings and arrows of feckless freshmen. The word play was even directed toward him and he was a soldier and he had a gun! Some people have no sense of self preservation. Aloha to you all. wow