OK - William Hacker-62 is generally believed to be the son of Francis Hacker III - 63, but neither profile provides a source for this claim. I suspect it may have originated with some 19th-century relatives who wanted a connection with notoriety - they could get kind of heated on these matters. At any rate, there seem to be no records showing William as the son of Francis, or Francis as the father of a William, but I believe he was the father of a Francis IV, which is another issue.
Recently, William's birthplace was changed to Andover, Hampshire. There is an Andover baptismal record for January 1 1691, giving a John Hacker as the father of a William Hacker, with a mother Ann[e], who could turn out to be Ann Bunney. That would be consistent with the birthdate generally attributed to William. If this is correct, he would have nothing at all to do with the Francis Hackers.
Slight as this evidence is, I think it is preferable to no evidence at all, but I would like to see confirmation from someone else.