Peter Jakobÿ and his family are recorded on the 1798 census of Paulskaya in Household No. Pl12.
There are no known surviving male lines of this Jakobÿ family among the Volga German colonies.
- 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): Pl12.