Where does “krajský” come from?
krajský (Czech) comes from Czech kraj, from Old Czech kraj, from Proto-Slavic krajь, from Proto-Slavic krojiti, from Proto-Balto-Slavic krájīˀtei, from Proto-Indo-European kroyh₁-eye-ti, from Proto-Indo-European kroyh₁-, from Proto-Indo-European kroh₁y- — to sift, to separate.
krajský (Czech): regional
Ancestry of “krajský”, step by step