Where does “otak” come from?

otak (Indonesian) comes from Malay otak, from Malay utak, from Proto-Malayic *u(n)tək, from Proto-Malayo-Polynesian *hutək,*qutək,*qutak.

otak (Indonesian): brain

Definitions

Step	Language	Word	Meaning
1	Malay	otak	brain
2	Malay	utak	Obsolete form of otak
3	Proto-Malayic	*u(n)tək	—
4	Proto-Malayo-Polynesian	hutək,qutək,*qutak	—

otak — Etymology, Origin & Word History | Etymology Explorer