Here's what you get when you simply search Hanua, Germany at FamilySearch.org catalog.  I don't know about the Lutheran church records in the United States, but they are worth looking as since they might indicate the exact location or parish from which your ancestors came.   Germany, Hanau-Munzberg Germany, Elsas-Lothringen-Hanua, Lichtenberg Germany, Prussen, Hessen-Nassau, Hanua Germany, Prussen, Hessen-Nassua, Hanua (Grafschaft) Germany, Prussen, Hessen-Nassua, Hanua-Munzberg (Grafschaft) Germany, Prussen, Hessen-Nassua, Bergen (Kr. Hanua) Germany, Prussen, Hessen-Nassua, Bischofsheim (Kr. Hanua) Germany, Prussen, Hessen-Nassua, Buchertal (Hanua) Germany, Prussen, Hessen-Nassua, Gronau (Kr. Hanua) Germany, Prussen, Hessen-Nassua, Hochstadt (Kr. Hanua)