I am also researching the Suthard family. I do have some info on Suthards, but not for the names that you listed. The oldest that I have is a Robert Suddarth born before 1690 which is a relative of mine.
So you have any Suthard/Southard/Suddarth family members in the mid to late 1700's? I have a Moses Suthard, which was the grandson of Robert.
Mike Habersack (maternal ggrandmother was Lula Ann Suthard of Page County)