Where does “Ukrajina” come from?
Ukrajina (Czech) comes from Ukrainian Украї́на, from Old East Slavic Украина, from Russian Украи́на, from Slavic Оукраина, from Old East Slavic краи, from Proto-Slavic krajь, from Proto-Slavic krojiti, from Proto-Balto-Slavic krájīˀtei — to sift, to separate.
Ancestry of “Ukrajina”, step by step
Words derived from “Ukrajina”