He and his descendants used the spelling O'Donniley whereas his brother James and his descendants used the spelling O'Donley; their father Benjamin used different spellings but may have used O'Donnilly.
Sources
"United States Census, 1840," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHYL-J62 : 19 August 2017), Henry Odonley, District 8, Humphreys, Tennessee, United States; citing p. 238, NARA microfilm publication M704, (Washington D.C.: National Archives and Records Administration, n.d.), roll 524; FHL microfilm 24,545.
"Tennessee, County Marriages, 1790-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZ7P-52L : 3 November 2017), Henry O Donnelly and Cynthia Moody, 30 Oct 1816; citing Davidson, Tennessee, United States, Marriage, p. 178, Tennessee State Library and Archives, Nashville and county clerk offices from various counties; FHL microfilm 200,294.
"Tennessee State Marriage Index, 1780-2002," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VNHX-68N : 4 December 2014), Henry O Donnelly and Cynthia Moody, 30 Oct 1816; from "Tennessee State Marriages, 1780-2002," database and images, Ancestry (http://www.ancestry.com : 2008); citing p. 178, Davidson, Tennessee, United States, Tennessee State Library and Archives, Nashville, Tennessee.
"Tennessee Marriages, 1796-1950," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XD3P-M4M : 11 February 2018), Henry O Donnelly and Cynthia Moody, 30 Oct 1816; citing Davidson,Tennessee, reference ; FHL microfilm 200,294.
"Tennessee, County Marriages, 1790-1950," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X81R-YJW : 21 December 2016), Henry O'Donnily and Cinthy Moody, 30 Oct 1816; citing , Davidson, Tennessee, United States, Marriage, p. , Tennessee State Library and Archives, Nashville and county clerk offices from various counties; FHL microfilm 1,994,215.
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DNA Connections
It may be possible to confirm family relationships with Henry 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 Henry: