Where does “fleusaz” come from?

fleusaz (Proto-Germanic) comes from Proto-Indo-European plews-, from Proto-Indo-European plúsis — flea.

Ancestry of “fleusaz”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	plews-	to pluck, a feather, fleece; to pull out, pluck
2	Proto-Indo-European	plúsis	flea

fleusaz — Etymology, Origin & Word History | Etymology Explorer