I'm a Hunn who came from St. Louis, Missouri.I'm doing my own research into the Hunn name as well. I don't have a Harrison Hunn, but I've found a Joseph Hunn + Franciksa Johanna Boschert that had a child, Joseph, in 1833.Theoretically they could have had more children closer to your Harrison's age. I believe they would have been in either St. Charles or St. Peters, Missouri. I also remember my father telling me there were Troy, Missouri Hunns that weren't related to us.Maybe Harrison came from there? Hope this helps a little.