German South West Africa -> Namibia
When Namibia was under German control, the country was known as “German South West Africa.” In 1990, the country became independent and had its name changed to “Namibia.” Over time, the names of cities and regions were changed as well. However, some citizens weren’t happy with these changes because they were so used to the original names.
https://en.wikipedia.org/wiki/Netherlands
#1 also in Germany we still call it "Holland", this name was never really taken away from them.
#4 well, the more important thing that happened was 1993 when Czechoslovakia separated into Czechia and Slovakia.
Too many times, incorrect names are applied to places for the sake of a foreigner's convenience. eg Munich and Cologne are not the names of the places.....