SC Marriage Records have him marrying a Margaret Jay in 1778 in South Carolina. No further details have been found beyond her name appearing on William's Find-A-Grave record. It is difficult to tell if Jay was her maiden name as well as her married name. Usually marriage records list by maiden name, but the one found had her name as Margaret Jay.
It may be possible to confirm family relationships with William by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with William: