Where does “sälä-” come from?

sälä- (Proto-Finnic) comes from Proto-Finno-Ugric śälä- — to cut, cut up, slice.

Ancestry of “sälä-”, step by step

Step	Language	Word	Meaning
1	Proto-Finno-Ugric	śälä-	to cut, cut up, slice

sälä- — Etymology, Origin & Word History | Etymology Explorer