[filoleg]

I wonder if this this region/language dependent. Because I remember that in russian, they’ve been called “Czechia” since at least when Czechoslovakia got broken up, but in english it still seems to be squarely referred to as “Czech Republic”.

[riffraff]

it's definitely language dependent, we used to (mostly) call it "Repubblica Ceca" in Italian but have largely switched to "Cechia" now.

Which is weird enough, since Italy is literally called "Repubblica Italiana" on our own passports, but we never call it that.