As I was reading extraordinarily well-researched Hitler's biographies (Hubris & Nemesis) by Ian Kershaw, I was struck by toponymic anarchy that exists in contemporary English--even in best books.
Same for Kōnigsberg.
Or Mamel that Germany asked Lithuania to give up in 1939. How many people know where is Mamel?
Idem for Brūnn (Brno).