I don't have any information on the Michigan Redners, but if I run across some I'll be glad to share it with you. We have a Charles Redner in our line who was born August 8, 1877. His parents were John Miller Redner, born June 1843, and Mary Elizabeth Cables. It is possible John and Mary got the name for their son Charles from an uncle or Great Grandparent. Most of the Redners I have found so far come from NY, NJ, Canada, and Germany.