The Knatz family that lived in Kassel Germany and which spread to Russia and other parts of Germany including Berlin Gelnhausen, Bromberg, and also St. Petersburg, Moscow, and Tallinn Estonia, was studied by Frau Dir. H. Glinzer, Hamburg-Blankenese and published on 31 December 1949. Excerpt of that genealogy which is titled “Vorfahren und Nachkommen des Schwerfeger-Ehepaares Christoph Siegmund Voelkel und Anna Christine geb. Riehl getraut in Cassel am 5 November 1758” is excerpted below. You will find on page 43 Marie Knatz, the mother of Nikita Knatz and on page 45 Ilse Knatz Ortabasi.