His actual first name is Henderson and "Henry" is his nickname, but I prefer the first name on the FindAGrave memorial to match what's on the headstone, regardless of whether or not it's their real name. (This prevents duplications from members walking the cemetery and thinking a memorial hasn't been created for the person yet). I had his first name listed as "Henry (Henderson)" but FindAGrave doesn't like having parentheses or other symbols in names.
(Headstone gives birth year as 1850, but this may be in error as the headstone was installed much later than he and his wife's actual deaths. Census records indicate his birth year may have been 1852 or 53).