Johann Friedrich Merk, a surgeon (Feldscher), his wife Maria Agnessia, and daughter Maria Katharina (age 3) are recorded on the 1767 census of Jost in Household No. 52. They had settled there on 19 August 1767.
The 1767 census records that Johann Friedrich Merk came from the German village of Münsingen in the region of Schwaben (Swabia).
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 2 (Göttingen: Göttinger Arbeitskreis, 2001): 207.