This couple is listed in 1880 census Milwaukee WI with last name of Bayer:
Mathius 28 Germany
Elizabeth 22 Germany
mother (hers?) Rosalia Drevnak 60 Germany
I'm guessing you found the marriage in the WI index of Elizabeth Drewniok Feb 04, 1879 to Mathias Byer, in Milwaukee county.
I'm not related.