Where does “jewä” come from?

jewä (Proto-Uralic) comes from Proto-Indo-European yéwos, from Proto-Indo-European yew- — to mix.

Ancestry of “jewä”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	yéwos	cereal, grain; barley, spelt
2	Proto-Indo-European	yew-	to mix

jewä — Etymology, Origin & Word History | Etymology Explorer