What language was the word stomach recorded?

The word "stomach" comes from Old French, where it was "estomac". It entered the English language in the 13th century.

The Old French word, in turn, came from the Latin word "stomachus," which itself was borrowed from the Greek word "στόμαχος" (stomachos).

So, while the word "stomach" is recorded in English, its origins lie in the Greek language.