My great grandfather converted our name from Wasserman (or Wascherman) upon seeking refuge in Canada to Waterman. His name was Hyman Wasserman and family lore indicates he was from Russia, although we are uncertain. He fled the region upon the rise of anti-semitism and Nazism in Germany. Our origins prior to 1900 has long been shrouded in mystery.
I do not know if this is any help to you, but if it is inform me. Please do so by replying to this thread.