Where does “raykʰ-” come from?

raykʰ- (Proto-Indo-Iranian) comes from Proto-Indo-European rikh₂-é-ti, from Proto-Indo-European reyk(ʷ)h₂- — to scratch.

Ancestry of “raykʰ-”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	rikh₂-é-ti	—
2	Proto-Indo-European	reyk(ʷ)h₂-	to scratch

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