Wrocław
Over the centuries Wrocław was under Polish, Bohemian, Prussian and Austrian rule and now is Polish once again. In such a melting pot/salad bowl most anything was possible.
Nowak is the most popular Polish name (over 200,000 users), but there are more thna 32,000 Nowaks in Germany. And their most common first names in Germany are: Peter Michael Josef Günter Manfred Andreas Wolfgang Werner Norbert and Heinz. Is Nowak a German name? No! Are the people listed above German? Yes!