There are multiple Müller lines in Frank.
Johann Ludwig Müller from the district of Hannover and his wife, Anna Regina, settled in the Volga German colony of Frank on 1 September 1767. They are recorded there on the 1767 census in Household No. 104.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Göttinger Arbeitskreis, 1999): 436.