Where does “*raku” come from?

*raku (Proto-West Germanic) comes from Proto-Germanic rakō, from Proto-Germanic rak-, from Proto-Indo-European h₃reǵ- — to straighten, to right oneself; right; just.

Ancestry of “*raku”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	rakō	direction, course, path, track; an unwinding,...
2	Proto-Germanic	rak-	to gather, heap up
3	Proto-Indo-European	h₃reǵ-	to straighten, to right oneself; right; just

Every word from Proto-Indo-European h₃reǵ- →

*raku — Etymology, Origin & Word History | Etymology Explorer