The word "vomit" was invented by the English poet John Skelton in the 16th century. He used the word to describe the act of vomiting and it has been used in English ever since.
They word vomit had been controversial but nevertheless traced to a poet John Skelton. In his works at the late 15century to 16th century, he made use of such word.
it comes from the ancient Indo-european language as “wemh”, through the Latin word 'vomitus' via old French 'vomite' and into English in around the 14th Century
Etymology. From Middle English vomiten, from Latin vomitāre, present active infinitive of vomitō (“vomit repeatedly”), frequentative form of vomō (“be sick, vomit”), from Proto-Indo-European *wemh₁- (“to spew, vomit”).