I saw your "Koller" request starting withHeinrich. My dad's birth certificate says Kohler, mine says Koehler, but my dad's name was Heinrich Johann Christian Kohler, b. 3 Nov 1904 in Schleswig, Germany. He married a Katherine Bach. My father's father's name was Friedrich Ludwig August Kohler. Looking for any help I can get. I know my father came from Germany to Minnesota. His cousins' names are Jahns or the American Jans. Several of them in Minnesota.