Johann or John was born about 1825 in Germany. John H. Herrmann and Elizabeth Becker are listed as parents of Louis B. Hermann on his marriage certificate of 1884.
Sources
Louisiana Parish marriages 1837-1957
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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: