There was a poll just a few weeks ago showing that a majority (fairly large I think) of 15-35yr olds in UK had never heard of Auschwitz.
The correct name is Oswiecim, not Auschwitz. After Germans invaded and occupied Poland, they annexed the Oswiecim region and renamed it Auschwitz.
They made there a camp mostly for the ethnic Poles. Next they made the other camp mostly for the Jews located a few kilometers away in Brzezinka (renamed by them Birkenau). It added to the confusion in the West. It is in Brzezinka where the Jews were being exterminated.
So how many of you have heard about Brzezinka? 1%?