I am trying to trace my wifes grandfather. His name was Edward Showerman. I have found the surname spelled different ways, sometimes Shorman, Sherman, Schuermann, Schurman. I have some evidence his fathers name was William, or Wilhelm. I know it probably is German in origin. I have found a Johan Scheurmann with a son Wilhelm in Germany. Edward Showerman was born in New York, ca. 1861, and died in Ingaham County Michigan in 1941. Any help will be most appreciated. Thank you.