Where does “אוישוויץ” come from?

אוישוויץ (Yiddish) comes from German Auschwitz, from Polish Oświęcim, from Polish Uswiczin.

Ancestry of “אוישוויץ”, step by step

Step	Language	Word	Meaning
1	German	Auschwitz	—
2	Polish	Oświęcim	—
3	Polish	Uswiczin	—