I also found a statement supporting your comments about the German names for Slavic people next to them. It is funny to see this German centric naming: Wendish speaking Germans (немцы, говорящие на вендиш).
Ben Frayle, MA Forbidden Sciences & Xenotheology, Miskatonic University (1900).
"Throughout the Third Reich, Sorbians were described as a German tribe who spoke a Slavic language and their national poet Handrij Zejler was German. Sorbian costume, culture, customs, and language was said to be no indication of a non-German origin. The Reich declared that there were truly no "Sorbs" or "Lusatians", only
Wendish-Speaking Germans. As such, while the Sorbs were largely safe from the Reich's policies of ethnic cleansing, the cultivation of "Wendish" customs and traditions was to be encouraged in a controlled manner and it was expected that the Slavic language would decline due to natural causes. Young Sorbs enlisted in the Wehrmacht and were sent to the front. Entangled lives of the Sorbs during World War II are exemplified by life stories of Mina Witkojc, Měrčin Nowak-Njechorński and Jan Skala.
The first Lusatian cities were captured in April 1945, when the Red Army and the Polish Second Army crossed the river Queis (Kwisa). The defeat of Nazi Germany changed the Sorbs’ situation considerably. The regions in East Germany (the German Democratic Republic) faced heavy industrialization and a large influx of expelled Germans."
https://www.quora.com/What-did-the-Sorbs-do-when-Hitler-attacked-the-SlavsSlavic people were not better at naming. We all like to patronize people of a different nationality, we do not take time to understand and respect. As a result,
Goths-Germans called us Veneti and Wendit, but almost all Slavic people call them uniformly by one same name, that did not change in most of the Slavic locations and religion changes for 1600+ years ... Here is the word used for German people in most of the Slavic Countries arrived from the fact that they "seem to be mute" in other words make "strange sounds" that we do not understand:
Німцi (на Укрианській); Немцы (па Руски); Немцы (BelRus); Niemcy (Polski); Nemci (Slovak); Němci (Czech); Nemci (Slovanian); Nijemci (Croatian/Hrvatski); Nemci (Bosnian), Немци-Nemci (Српски-Srpski) ...