Where does “obyčěj” come from?

obyčěj (Old Czech) comes from Proto-Slavic obyčajь, from Proto-Slavic -ějь, from Proto-Balto-Slavic -ēˀjas.

Ancestry of “obyčěj”, step by step

StepLanguageWordMeaning
1Proto-Slavicobyčajьcustom, tradition; habit, routine
2Proto-Slavic-ějьDeverbal from stative verbs inflecting in *-ěti....
3Proto-Balto-Slavic-ēˀjas—

Words derived from “obyčěj”

Every word from Proto-Balto-Slavic -ēˀjas →Every word from Proto-Slavic -ějь →Every word from Proto-Slavic obyčajь →
obyčěj — Etymology, Origin & Word History | Etymology Explorer