Where does “South Cotabato” come from?

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

Ancestry of “South Cotabato”, step by step

StepLanguageWordMeaning
1EnglishSouth Cotabato—
2EnglishCotabato—
3SpanishCotabato—
4MaguindanaoKutawatu—
5Maguindanaowatustone; rock
6Proto-Philippine*batustone substance; small piece of stone
7Proto-Malayo-Polynesianbatustone
8Proto-Austronesian*batuxrock; stone
Every word from Proto-Austronesian *batux →Every word from Proto-Malayo-Polynesian batu →Every word from Proto-Philippine *batu →