Johann Jakob Würfel was born in Sinsheim (now in Baden-Württemberg) on 29 August 1725. He married on 26 August 1759 in Leimen (near Heidelberg) to Maria Barbara Blättel. She was born in Leimen on 10 November 1835.
They moved to Denmark (Schleswig-Holstein). The baptisms of two children were recorded in Danish records: Anna Christina, baptized 6 Aug 1760, and Anna Barbara, baptized 25 April 1762, both in Karup Parish, Viborg Amt.
- Lang, Gerhard. German Colonists of Denmark on the Volga .
- 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).
- Danish parish record extractions by Wayne Bonner
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Göttinger Arbeitskreis, 1999): 58.