Marriage record indicates that Mary's maiden name is Vanover, in addition to her marrying Daniel Vanover.
Note on Parents
There could be a transcription error on her marriage record regarding the name of her mother. It could be "Rhoda".
The death record of Nannie Johnson indicates that her mother's maiden last name is "Long". This could indicate the parents of Mary as Henry Vanover and Rhoda Long. It could be due to embarrassment that Daniel and Mary are cousins. Death records of other children do not give Mary's last name.
Sources
"Virginia Marriages, 1785-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X5YN-P6H : accessed 28 April 2016), Daniel S. Vanover and Mary Vanover, 17 Mar 1859; citing Wise, Virginia, reference p 3 cn 119; FHL microfilm 34,394.
"United States Census, 1860", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHM7-4JP : accessed 28 April 2016), Mazy Z Vanover in entry for Daniel S Vanover, 1860.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCZP-7P7 : accessed 28 April 2016), Meazy A Vanover in household of Daniel S Vanover, Upper Elkhorn Creek, Pike, Kentucky, United States; citing enumeration district ED 102, sheet 684B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0439; FHL microfilm 1,254,439.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9HG-YPB : accessed 28 April 2016), Mazy Vanover in household of Danial Vanover, Magisterial District 2, Pike, Kentucky, United States; citing sheet 8B, family 139, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,548.
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DNA Connections
It may be possible to confirm family relationships with Mazy by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Mazy: