My Great Great Grandfather was Hermanus. His son was Jacob; and his son Ralph was my Grandpa. We(my parents) had a book that was published by my Dad's Aunt Kitty (Katherine), wife of John, Ralph's brother. The book said that at Ellis Island he was urged to change his name to Cooper so that he would fit in better in the settlement of Coopersville, MI. That's where they went.
Does any of that sound familiar? I am pretty sure I can get one to copy if you would be interested let me know.
rjoelcooper@gmail.com