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The camp took its German name from the hosting town of Oświęcim. Following the German invasion of Poland in September 1939, Oświęcim was annexed by Nazi Germany and renamed Auschwitz, the town's German name.[1] Birkenau, the German translation of Brzezinka (birch tree), refers to a small Polish village nearby which later was mostly destroyed by the Germans.
Auschwitz concentration camp - Wikipedia