There are multiple Müller lines in Frank.
Johann Martin Müller, a farmer from Hessen-Darmstadt, and his wife, Christina, settled in the Volga German colony of Frank in 1767. They are recorded there on the 1767 census in Household No. 75.
- 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): Fk016.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Göttinger Arbeitskreis, 1999): 430.