Where does “vaiva” come from?

vaiva (Proto-Finnic) comes from Proto-Germanic waiwô, from Proto-Indo-European wai — oh!; woe!.

vaiva (Proto-Finnic): bother, inconvenience; pain, illness, torment

Definitions

Step	Language	Word	Meaning
1	Proto-Germanic	waiwô	woe, grief, misery; evil, wickedness, malice
2	Proto-Indo-European	wai	oh!; woe!

vaiva — Etymology, Origin & Word History | Etymology Explorer