Good point about the "F" . The name Thadison has no proof. I have seen that passed around for years on the internet. As far as I know I am the first to research my Samuel T. Hilburn many many years ago and I have found NO document, Bible, or any source that indicates that was his middle name. I do not list this as his middle name so I just list "T".
I feel that those early Hilburns in Lawrence, later Copiah must have all been related. One of these days I would like to go to those county court houses and "sleuth".