Source: S1 "Maine Births and Christenings, 1739-1900," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F4HG-V9P : 10 February 2018), Thomas B. Johnson in entry for William Henry Johnson, 17 Oct 1832; citing HALLOWELL,KENNEBEC,MAINE; FHL microfilm 1,033,824.
Source: S7 "Record of Families of the Name Rawlins or Rollins", by John R. Rollins, published by GEO. S. MERRILL Sr. CROCKER, PRINTERS, LAWRENCE, MASS. in 1874. Text is located under UNNASSIGNED RECORDS AND MEMORANDA, page 301 
Thank you to Elizabeth x for creating WikiTree profile John-662 through the import of Lint, Rollins, Mundo.ged on May 4, 2013. Click to the Changes page for the details of edits by Elizabeth and others.
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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: