William Elliot was born on 5 Oct 1748. He was the son of John Elliot and his wife Mary.
William Elliot was baptised on 31 Oct 1748 in St mary's Church St Marylebone, London, England.
William Elliot was married to Rachel Marshall... 
Children of William Elliot and his wife Rachel Marshall;
1. Rachel Elliot. b. 1774 in Queens Square, Middlesex, England.
Birth & Baptism. "England Births and Christenings, 1538-1975," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JWZP-QXJ : 11 February 2018, William Elliott, 05 Oct 1748); citing , index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 580,904, 580,905.
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: