I am looking up the Olgardt family everywhere in the U.S. I believe that all people in the U.S. bearing the name in that spelling are related to each others and descent from:
Henry C. Olgardt, b.May-1844 in Calbe/Saale, Saxony Province, Prussia, Germany, d. 01-Jan-1935 Great Falls, Montana. His German name, however, was Johann Heinrich Oelgardt. According to the Staten Island Parish register, he was son of a Johann Christian Oelgardt and his wife Elisabeth Sophie Meyer.
He had only one surviving son:
Charles F Olgardt, b.2-Sep-1872 Staten Island, NY, d.22-Jun-1956 Great Falls, MT, m.2-Sep-1902 Katharina Pilgeram, b.16-Apr-1884 Thalheim, Nassau Province, Prussia, Germany, d.29-Mar-1951 Great Falls, MT
Charles and Kathy were reported to have four kids:
Edward (1903-1962), John Paul (or Jake?, 1905-1988), Joseph William (1908-1978), and Florence (1922-1967)
If ever anybody feels to be related to this family tree, is welcome to contribute to this tree and will be invited to see the full tree.