William Johnson is my 5th great grandfather through his son William . This has been proven by ydna testing and extensive research. One of my ydna matches in Illinois is a descendant of William Johnson's son Nathaniel through Arthur L Johnson. We both belong to the ydna branch R-FGC13355 which is a subclade of the R-U106 haplogroup. All of our oversea matches are found in Finland at R-L127 the father clade of R-FGC13355. Hopes this helps.
Ernest Knoxie Johnson