While browsing the 1880 census for Pewaukee WI (Waukesha Co.) I came across a Herman Nieber, age 20, farm labor, from Prussia. I also found some Niebers in Benton Co. IA, Kane Twp. 1920 census: Edward and Minnie; Joe and Anna; Elmer and Irma.
I am still looking for the Nieber who married Sophie Bence. She was born 1839 in PA, family moved to WI 1843 Washington Co., then moved to Waukesha some time later. By the time she was marrying age they were in Waukesha. I am not sure this is correct spelling. The handwriting on the will was not very clear.