Where does “коне́чный” come from?

коне́чный (Russian) comes from Old East Slavic коньчьнꙑи, from Proto-Slavic *konьčьnъ.

коне́чный (Russian): final

Definitions

final

Ancestry of “коне́чный”, step by step

Step	Language	Word	Meaning
1	Old East Slavic	коньчьнꙑи	—
2	Proto-Slavic	*konьčьnъ	—

Words derived from “коне́чный”

конечно

Every word from Proto-Slavic *konьčьnъ →

коне́чный — Etymology, Origin & Word History | Etymology Explorer