i mean everyone has a different name for germany though: france says allemagne after the tribe that was closest to them, the romans said germania after the tribe that was closest to them (and that's where english gets it from), poland says "niemcy" because they considered german to be utter nonsense speech, and german-speaking countries say some variation on "deutschland" meaning land of the people.

exonyms and endonyms are a part of all languages, it just depends on when and how a language started caring about said country/city. Hence why you generally only have exonyms for the largest cities of countries, that's what anyone outside the country cares about.