Where does “wibros” come from?

wibros (Proto-Italic) comes from Proto-Indo-European weyb- — to oscillate; swing; rotate, move.

Ancestry of “wibros”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	weyb-	to oscillate; swing; rotate, move

wibros — Etymology, Origin & Word History | Etymology Explorer