Onomastics is a fascinating area of linguistics concerned with the study of the history and origin of proper names.
Nobody can understand all of the languages the names come from, which is why there is a 2nd map, now with a translation of the names above into English:
Note also that when there are two vastly different linguistic communities within a country. This was the case of Belgium (the two names are for the Dutch- and French-speaking parts) and Estonia (with Russian and Estonian names). Article by => https://jakubmarian.com/