I believe his name was Isaac Allen Hill.
One of his sons was Jason Allen Hill(my great grandfather.)
My family has Jason's family Bible.
He named one of his sons, Alfred Allen Hill( mygrandfather).
Alfred named his eldest son, Henry Allen Hill who was my Dad.
My eldest brother is Jeffery Allen Hill and his eldest son is Jason Allen Hill. As you can tell the middle name of Allen has been past down through the generations. Best Wishes with your search. Pamela