My husband's maternal g-grandfather was Karl Emil Otto. born 1/7/1837. 1880 census lists him as having been born in Sachsen. He emmigrated to the US from Mansfield in Gadfen, Germany in 1864. His obit says his father was a principle in the city schools and he had an older brother who was a pastor in Germany. Karl Emil came to the US to serve as a minister in the German Luthern Church. He married Amalie Otto, a distant relative. Do any of these names link up to your Sachsen Ottos?