Hi Alan
John Voss was brother of my great-great grandfather, George Voss, so you are my 4th cousin. The name change of two of his children after his death, is, as far as I know, still a mystery.
Would love to know more. I have a pretty well researched tree abounding with Vosses, so please contact me (alij197 on ancestry.com).
Warm regards
Alison