William was the son of William Dunn.
https://familysearch.org/tree/person/MR8W-P56/details
England Births and Christenings, 1538-1975," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NYX2-QX4 : 11 February 2018, William Dunn, 25 Oct 1685); citing , index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 254,175, 254,176, 254,177.
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https://familysearch.org/tree/person/MR8W-P56/details