He apparently had three wives:
Sarah Knight, Anna Ellsworth and Ann Hardy.
Sources
Lorenzo Sayles Fairbanks, Genealogy of the Fairbanks Family in America 1633-1897 (Boston, MA: pub. by the author [American Printing & Engraving Co.], 1897)
"Utah Death Certificates, 1904-1964," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XZPL-DT4 : 11 September 2015), Susan Maudville in entry for William Henery Fairbanks, 10 Aug 1923; citing Payson, Utah, Utah, United States, certificate 309, series 81448; Utah State Archives Research Center, Salt Lake City, Utah; FHL microfilm.
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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: