Where does “vieraanvara” come from?

vieraanvara (Finnish) comes from Finnish vieras, from Proto-Finnic veeras, from Proto-Finnic veeri, from Proto-Finno-Permic wäre.

Ancestry of “vieraanvara”, step by step

Step	Language	Word	Meaning
1	Finnish	vieras	unfamiliar; foreign; guest, visitor
2	Proto-Finnic	veeras	guest, visitor; stranger; strange, foreign,...
3	Proto-Finnic	veeri	side, flank; edge
4	Proto-Finno-Permic	wäre	—

vieraanvara — Etymology, Origin & Word History | Etymology Explorer