My records show that your ancestor was Robert DeShazo b. 1758 instead of William Robert DeShazo.My ancestor was William Richard DeShazo b. 1759 who was a brother of your ancestor.Your ancestor married Mary Sawyer while mine married Jane (Gincy) King on Nov. 1794.
Siblings of Robert and William Richard DeShazo include:Robin, Robert Bohannon, Clembernett b. 1775.There may have been others.
I have seen the DeShazo website with lots of names and dates.