Where does “ika” come from?

ika (Bikol Central) comes from Proto-Malayo-Polynesian i-kahu, from Proto-Austronesian i-kaSu.

Ancestry of “ika”, step by step

Step	Language	Word	Meaning
1	Proto-Malayo-Polynesian	i-kahu	—
2	Proto-Austronesian	i-kaSu	—