Where does “*aku” come from?

*aku (Proto-Philippine) comes from Proto-Malayo-Polynesian aku, from Proto-Austronesian aku.

Ancestry of “*aku”, step by step

Step	Language	Word	Meaning
1	Proto-Malayo-Polynesian	aku	—
2	Proto-Austronesian	aku	—

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