The Church of Jesus Christ of Latter-day Saints, "Ancestral File," database, FamilySearch (https://familysearch.org/ark:/61903/2:1:MWP2-8NV : accessed 2018-01-31), entry for Johann Wilhelm MERTGEN.
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DNA Connections
It may be possible to confirm family relationships with Johann by comparing test results with other carriers of his Y-chromosome or his mother's 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 Johann: