Johann Karl Friedrich Jäger (9-months) is recorded on the 1767 census of Beauregard in Household No. 38 along with his mother and stepfather, Johann Georg Maaß.
There are no known surviving male lines of this Jäger family among the Volga German colonies.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Göttinger Arbeitskreis, 1999): 187.