Johann Michael Klöckler, son of Hans Michael Klöckler, was born in 1716 near Heilbronn. He married Sophia Knodel, daughter of Hans Michael Knodel, on 27 May 1749 in the Kürnbach Evangelical Church, southwest of Heilbronn.
They had five children, each baptized in Hüffenhardt, northwest of Heilbronn: (1) Philipp Anton, baptized 21 March 1750; (2) Philippina Katharina, baptized 12 June 1751; (3) Johannes, baptized 2 January 1753; (4) Johann Kaspar, baptized 21 May 1755; and (5) Georg Martin, baptized 10 November 1756.
All of them, except the youngest son Georg Martin, immigrated to Denmark (Schleswig-Holstein), departing from Altona, Duchy of Holstein, on 5 May 1761 under the leadership of Andreas Kirchhof. They arrived in the city of Schleswig, Duchy of Schleswig, on 9 May 1761. Their surname is recorded there as Glacklerm, Glöckler, or Glöckner.
They left Denmark on 3 May 1763, and immigrated to Russia. Johann Michael's family arrived in the Volga German colony of Stahl am Karaman on 9 July 1766. They are registered as Glöckner on the Stahl am Karaman 1767 Census in Household No. 6.
Glöckner descendants are recorded on the Stahl am Karaman 1798 Census in Households No. Sk25 & Sk39.
- Eichhorn, Alexander; Eichhorn Jacob & Mary. The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766 (Deiningen, Germany: Steinmeier, 2012): 256, 417, & 686.
- 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): Sk25, Sk39.
- Parish records of Kürnbach (LDS Film No. 1272389).
- Parish records of Hüffenhardt (LDS Film No. 1189311).
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Nordost-Institut, 2008): 192, 193.