"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4BL-241 : 4 April 2020), William D Byrd in household of John Byrd, Yancey county, part of, Yancey, North Carolina, United States; citing family 163, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
Find a Grave, database and images (https://www.findagrave.com : accessed 23 May 2020), memorial page for Pvt William Dennis Byrd (1843–unknown), Find a Grave Memorial no. 72432100, citing Byrd Branch Cemetery, Burnsville, Yancey County, North Carolina, USA ; Maintained by Gwen Bodford (contributor 47283534) .
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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 ancestors' Y-chromosome or 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: