Where does “saku” come from?

saku (Proto-West Germanic) comes from Proto-Germanic sakō, from Proto-Indo-European seh₂g- — to seek out.

saku (Proto-West Germanic): accusation, charge; case

Definitions

Step	Language	Word	Meaning
1	Proto-Germanic	sakō	quarrel; charge, case, lawsuit; thing, matter
2	Proto-Indo-European	seh₂g-	to seek out

saku — Etymology, Origin & Word History | Etymology Explorer