Sorbian costume, culture, customs and even the language was said to be no indication of a non-German origin.
From the en.wikipedia.org
Sorbian language and culture could only be publicly presented as long as they promoted Socialistic ideology.
From the en.wikipedia.org
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A speaker of Sorbian
A Slavonic language spoken in rural area of southeastern Germany
Sorbs (Serbja; Serby also known as Wends, Lusatian Sorbs or Lusatian Serbs) are a Western Slavic people of Central Europe living predominantly in Lusatia, a region on the territory of Germany and Poland. In Germany they live in the states of Brandenburg and Saxony. ...
SORBS (Spam and Open Relay Blocking System) is a list of e-mail servers suspected of sending or relaying spam (a DNS blacklist). It has been augmented with complementary lists that include various other classes of hosts, allowing for customized email rejection by its users.
Of or pertaining to the Sorbs or to the Sorbian language; A group of Slavic languages spoken by a minority in eastern Germany