Where does “wana-” come from?

wana- (Proto-Germanic) comes from Proto-Germanic wanaz, from Proto-Indo-European h₁weh₂- — to leave, abandon, give out.

Ancestry of “wana-”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	wanaz	lacking, deficient, absent; accustomed
2	Proto-Indo-European	h₁weh₂-	to leave, abandon, give out

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