Nikolaus Klein, a farmer, and his wife, Anna Maria Köhler, settled in the Volga German colony of Köhler on 21 August 1767. They are recorded there on the 1767 census in Household No. 61.
In 1792, Johannes Klein moved from Köhler to Hildmann. In 1795 Johann Gottfried Klein moved from Köhler to Leichtling.
Jakob Klein from Leichtling and his family are recorded on the 1857 census of Marienfeld.
The 1767 census records that the Kleins came from the German village of Gemünden am Main.
- 1857 Marienfeld Census.
- Mai, Brent Alan. 1798 Census of the German Colonies along the Volga (Lincoln, NE: American Historical Society of Germans from Russia, 1999): Hd24, Lg28, Mv1324, Mv1335.
- Pleve, Igor. Einwanderung in das Wolgagebiet 1764-1767 Band 2 (Goettingen: Der Göttinger Arbeitskreis; 2001): 374.