Although Swaziland -> Eswatini has gained ground so much that Wikipedia now uses the latter as the primary name.
Why? You don't call Istanbul Constantinople anymore.
Those are both different words from the previous, not less-familiar and less-phonetically-intuitive versions of the same word. Heck, in Eswatini's case, it's arguably easier to read and pronounce than Swaziland. Your parallels make no sense.
You think so? I think Swaziland is remarkably intuitive to read and pronounce. But thats probably because land is an English word to begin with.
