Hi Sue...
I hadn't thought about it in my earlier email. I've run across lots of "Henry" as middle names, my great uncle Wm Henry Taggart included. Maybe the unknown Henry was being referred to by his middle name to diff from someone else close in the family with the same first name. In our case, my John Frank Taggart, Wm Henry's younger bro, was referred to by both his first and middle names, as his parents had an earlier "John" die as a young child and they wanted to still use John going forward.