Where does “Skonieczny” come from?

Skonieczny (Polish) comes from Polish konieczny, from Old Polish konieczny, from Proto-Slavic *konьčьnъ.

Ancestry of “Skonieczny”, step by step

Step	Language	Word	Meaning
1	Polish	konieczny	necessary
2	Old Polish	konieczny	—
3	Proto-Slavic	*konьčьnъ	—

Skonieczny — Etymology, Origin & Word History | Etymology Explorer