The spelling of the word "Costillo" is based on the Spanish language. In IPA phonetic transcription, the pronunciation of "Costillo" is /kɔsˈtiʎo/. This word consists of six letters and two syllables. The first syllable is pronounced as "kos", which sounds like "cause" without the "e". The second syllable is "tiyo," pronounced like "teeyo". The "ll" sound in Spanish is pronounced like a "y" sound in English. Overall, the spelling of "Costillo" accurately represents its pronunciation in Spanish.
The word "Costillo" appears to be of Spanish origin. It is derived from the Spanish word "costilla", which translates to "rib" in English. The etymology of the Spanish word can be traced back to the Latin "costa", meaning "rib", and ultimately to the Proto-Indo-European root "kost", which also gave rise to related words in other Indo-European languages.