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This took a while so I hope it's appreciated.
I used the Top 10 of most common German surnames and saw its density among different regions in the aforementioned countries.
The top 20 is composed in general terms by Southern Brazil and South-East Brazil (incl. Sao Paulo but not Rio); The Pampas region (inc. Buenos Aires) and part of the Argentinian Patagonia; Southern Chile and the Santiago–Valparaíso area.
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