My Dad was a William Gash born 17-9-1907. I don't think that he will be directly descending from your tree but there could be a connection back to David Gash born 3-9-1749 who married Ann Thorpe 27-1-1767 and they had the following children - Susannah 19-12-1767, John 9-7-1769, who married Susan ?, Ann 11-11-1770 and Sarah 30-9-1773.
We are unable to go back any further and are stuck on David Gash as we can't find his parents who we think are David and Alice.
We are still trying to trace any relations regarding the above to fill in our tree.
This may or may not be of any help but Good Luck anyway.