We may be nearing the home stretch here, but I didn’t want to get there without mentioning the case for the (apparently) unloved current name for the homeland of the Czechs: the Czech Republic. Side note: I have yet to hear from a native English-speaker who thinks that “Czechia” is a great idea. This matters because the whole point of Czechia is to give the country a new “short English name.”
Andrea Orzoff, of the history department at New Mexico State University in Las Cruces, writes about the actual merits of “Czech Republic,” as opposed to mainly pointing out (as I have done) the defects of its proposed replacement, “Czechia.” She writes:
There's a better, more historically grounded reason to keep "Czech Republic" than euphony. Czechoslovakia came into existence because its leaders promised to craft a democracy at home and foster democratic internationalism through the League of Nations.
They kept that promise, however imperfectly. Czechoslovakia maintained an adherence to democracy through 1938, and again from 1945 to 1948.