The story
- Proto-Slavic*xъrvatъ
- Old Church SlavonicХръватъ (Xrŭvatŭ)
- Ancient GreekΧρωβάτος (Khrōbátos)
- Ancient GreekΧρωβατία (Khrōbatía)
- Medieval LatinCroātia
- English todayCroatia
Borrowed from Medieval Latin Croātia, equivalent to modern Croat + -ia.
Etymology from Wiktionary, CC BY-SA 4.0.