Where does “kostilya” come from?

kostilya (Bikol Central) comes from Spanish costilla, from Latin costa, from Proto-Indo-European kost-.

Ancestry of “kostilya”, step by step

StepLanguageWordMeaning
1Spanishcostillarib; a type of biscuit or cookie filled with jam
2Latincostaa rib; a side, a wall
3Proto-Indo-Europeankost-—
Every word from Proto-Indo-European kost- →Every word from Latin costa →Every word from Spanish costilla →
kostilya — Etymology, Origin & Word History | Etymology Explorer