William's daughter-in-law was also named Sarah Stewart. Her only child was born in 1804; the year she died. A good assumption is child-bed-fever. She was the wife of William's 10th. child, Isaac.
He passed away in 1789.
Sources
Ancestry.com, North Carolina Marriage Records, Thyatira Presbyterian Church Records
"North Carolina, County Marriages, 1762-1979 ," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XFSV-ZV9 : 3 November 2017), William Cowan and Sarah Stewart, 23 Dec 1759; citing Rowan, North Carolina, United States, p. , Office of Archives and History, Division of Archives and Records. State Archive of North Carolina and various county Register of Deeds; FHL microfilm 500,949.
Pg 73 of Register of Deeds marriage license index list 1741-2004
William Cowan b 1727 Salisbury, Lancaster PA
Marriage record to Sarah Stewart 23 Dec 1759 Rowan, NC
From the tree of Tracy Henning :
Listed in the family of William 1727 and Sarah Stewart 1734 are the following:
Edward 1753-1832
Lieut William David 1755-1842 we have a David on our DNA list b 1755
Margaret 1757
John 1757
James 1761
George 1763
Thomas 1765
Sarah 1770
William 1771
Stewart 1774
Elijah 1775-1811
Isaac 1775 ?
Lydia 1775
Mary “Polly” 1779
Sherad 1781
Moses 1787
Joseph 1788
children born in NC and GA
William Cowan b 1727 Salisbury, Landcaster PA
Marriage record to Sarah Stewart 23 Dec 1759 Rowan, NC
Pg 73 of Register of Deeds marriage license index list 1741-2004
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DNA Connections
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 some percentage of DNA with William:
Cowan-6040 and Cowan-1690 appear to represent the same person because: Most info matches. Same spouse (listed in bio). Son matches, birth dates are very close. Could easily be a mistake, especially during this time period.
I'm not 'up' on this particular profile, so I'll leave it to y'all to set the birth & death dates up. I don't know what 'sources' might apply there.
That 'Family Tree' might be a good candidate to move out of 'sources' and put into a category titled: = Research Notes =
An on-going Y-DNA Study has tied this "Pequea Creek" Cowan clan to several other branches in Ireland, Scotland, England, Canada and USA. Cowan-2845 is just one example. The Y-Haplogroup is R-BY3644. Participation of other male Cowan in the Y-DNA study would be welcome. For more information contact the Profile Manager of Robert Cowan.
I'm not 'up' on this particular profile, so I'll leave it to y'all to set the birth & death dates up. I don't know what 'sources' might apply there. That 'Family Tree' might be a good candidate to move out of 'sources' and put into a category titled: = Research Notes =