Before I answer this question.I would like to ask you why your name is called as your name? Why mom is called mom? Why dad is called dad? Why earth is called Earth? and why people are called people?...
It does have to do with the feeling you get in your stomach when you get nervous, excited or you when you are in love. it really has nothing to do with butterflies.
ORIGIN Middle English : from Old French estomac, stomaque, viaLatin from Greek stomakhos 'gullet,' from stoma 'mouth.' The early sense of the verb was [be offended at, resent] (early 16th cent.).New...