Where does “Cotabato” come from?

Cotabato (Spanish) comes from Maguindanao Kutawatu, from Maguindanao watu, from Proto-Philippine *batu, from Proto-Malayo-Polynesian batu, from Proto-Austronesian *batux — rock; stone.

Ancestry of “Cotabato”, step by step

StepLanguageWordMeaning
1MaguindanaoKutawatu—
2Maguindanaowatustone; rock
3Proto-Philippine*batustone substance; small piece of stone
4Proto-Malayo-Polynesianbatustone
5Proto-Austronesian*batuxrock; stone

Words derived from “Cotabato”

Every word from Proto-Austronesian *batux →Every word from Proto-Malayo-Polynesian batu →Every word from Proto-Philippine *batu →