Example of the interplay between history and genetics.
The imagine shows the genetic distance of two samples to national averages.
It is a beatiful example of the complex and diverse history of Styria/Stajerska and Slovenia. A genetic sample created from Edelschrott(at least 5 generations back and entirely german surnames) in Western Styria clusters closer to the Slovenian average than to the Austrian one. The reason for that is that the area around Edelschrott is often cited by historians as the (Austrian)-Styrian region with the strongest Carantanian Slavic substrate, the area was one of the most densely populated by Slavs, before Bavarian settlers arrived and even survived as a Slovene language exclave while 95% of (Austrian)-Styria was already German-speaking.
On the opposite is a sample 50% from Krapje north of Ljutomer and 50% from Sicheldorf/Zetince near Radkersburg/Radgona. Even though it is entrirely made up of Slovenian surnames (going back 5 generations) it clusters more closely with the Austrian average. The reason for this can be found in history again. While the Carantanian Slavs (especially the tribe of the Dulebs) settled these areas in the 6th century the later arrivals of the Magyars(Hungarians) changed the settelment structure in the region. Continuous Hungarian raids from 880-1040 wiped out almost all Carantanian (and the few Carolingian German) settlments in Eastern Styria and Stajerska especially along the Mura river and in parts of Prekmurje. To revitalize the areas in the 11th to 13th century the ruling aristocracy sent Bavarian and Lower Austrian settlers to repopulate the empty areas. This led to eastern Styria being a genetic outlier in Austria often clustering closer to Bavaria than surrounding regions. But the genetic mark was also left in Northeastern Stajerska in which these later Bavarian settlers, just like the Slovenes in Upper Styria, assimiliated into the the local population. This leaves us with a genetic sample from Prekmurje/Ljutomer/Radgona that while being made up entirely of Slovene surnames, lays genetically closer to Austria, than to the Slovene average.
(Both samples family trees were traced back at least 5 generations and are 100% from the area.)