Where does “raiwō” come from?

raiwō (Proto-Germanic) comes from Proto-Indo-European reyk- — to tear, scratch; streak; to carve, scratch, etch.

Ancestry of “raiwō”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	reyk-	to tear, scratch; streak; to carve, scratch, etch

raiwō — Etymology, Origin & Word History | Etymology Explorer