Johann (Georg) Heinrich Derr, a farmer and weaver (Weber), his wife Regina, and children (Johannes, age 3; Margaretha, age ½-year) immigrated to Denmark (Schleswig-Holstein) arriving in Flensburg on 1 October 1764. They are last recorded in the Danish colonies on 22 April 1765.
They joined the migration to Russia. Heinrich Derr and his family settled in the Volga German colony of Rosenheim on 15 March 1766. They are recorded there on the 1767 census in Household No. 45.
The 1767 census records that Heinrich Derr came from the German village of Mühlbach in the Kurfürstentum Pfalz. The Eichhorns record that Johann Georg Heinrich Derr came from the German region of Württemberg.
- Eichhorn, Alexander, Jacob & Mary Eichhorn. The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766 (Deiningen, Germany: Drukerei und Verlag Steinmeier GmbH & Co. Kg, 2012): B-279.
- Mai, Brent Alan. 1798 Census of the German Colonies along the Volga: Economy, Population, and Agriculture (Lincoln, NE: American Historical Society of Germans from Russia, 1999): Rm21.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 73.