This man keeps getting named as William Heinrich Mertz. There is simply no evidence at all he had that middle name. In every record he was William.
He also is often said to have been the son of Johan Wilhelm Mertz (1739-1803) who died in Somerset County, PA but I simply don't think that is true..
We cannot totally document who his father was but the evidence in my opinion is incredibly strong it was John Philip Mertz (brother of Wilhelm) and his wife Catharina.
William passed away in 1854, and was buried at Briar Creek Union Cemetery, Briar Creek, Columbia County, Pennsylvania.
Submitted by: Oakey Mertz
Gravesite Details: husband of Elizabeth; age 86yrs 3mon 25 days
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Featured National Park champion connections: William is 16 degrees from Theodore Roosevelt, 21 degrees from Stephanus Johannes Paulus Kruger, 15 degrees from George Catlin, 16 degrees from Marjory Douglas, 22 degrees from Sueko Embrey, 16 degrees from George Grinnell, 26 degrees from Anton Kröller, 17 degrees from Stephen Mather, 23 degrees from Kara McKean, 16 degrees from John Muir, 18 degrees from Victoria Hanover and 26 degrees from Charles Young on our single family tree. Login to find your connection.
https://www.mertzgenealogy.com/reunion/Family_Tree/ps08/ps08_071.html