Johann Jacob Jacobi married Anna Maria Stauch, and they had six known children, each baptized in the Evangelical Church of Neunstetten, 30 kilometers northeast of Heilbronn: (1) Hans Michael, on 17 October 1748; (2) Hans (Johann) Wilhelm, on 17 February 1751; (3) Johann Jacob, on 3 February 1755; (4) Johann Valentin, on 28 January 1757; (5) Georg Philipp, on 26 October 1759; and (6) Friedrich Eberhard, on 15 May 1763.
Johann Jacob Jacobi and his family emigrated to Russia, departing from Lübeck on the ship Der Junge Mathias with skipper David Wollert at the helm. They arrived at the port in Oranienbaum on 4 July 1766.
Johann Jacob Jacobi, his wife, and four of their children arrived in the colony of Dönhof on 18 June 1767, where they are recorded on the 1767 census in Household No. 75.
On the 1798 Census of Dönhof sons Johann Wilhelm, Johann Jacob & Johann Valentin are recorded there in Households No. Dh063, Dh074 & Dh079, respectively. Son Georg Philipp had died at some point before 1798. The widow of son Georg Philipp and his children are recorded on the 1798 Census in Frank in Household No. Fk064.
This surname has been spelled at various times as Jacobi, Jacoby, Jacobÿ, Jakobi, Jakoby, and Jakobÿ.
- 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).
- Parish records of Neustetten (LDS Film No. 1272771).
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Der Göttinger Arbeitskreis, 1999): 361.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): 134.