I have found a relative with the Mellwig surname, although she was married into it.Her name was Judith; I don't have her husband's name at this point, but do know from an 1880 census that he was born in Bavaria.They had children Mary J. (b. abt. 1860 in Illinois), Eva F.(b. abt. 1862 in Wisconsin), and Charles F. (b. abt. 1864 in Illinois).Do you have any info. which might fit this?