I've only looked in a couple of the books I have, but didn't see the name. It's possible that a MADISON that I have is yours, however :) It's interesting that your William was in Ohio, Muhlenburg, KY and Indiana. This coincides with some of my other family members (more like offshoots), that were in the same places. The KEATH surname comes to mind. I'll keep looking around and if I find anything substantial, I'll be sure to post it here.