Did you know that the word "barbarian" comes from the Medieval Latin barbarinus, meaning "foreign, of another nation or culture"? The Latin word is from the root barbar-, which was used to imitate the unintelligible speech of foreigners, originally from the Sanskrit barbara-, meaning "stammering." In fact, originally the word barbaroi meant "all who are not Greek," but after the Romans took over much of the world, they started applying it the term to non-Greeks and non-Romans—although by the Greek definition, they themselves were actually barbaroi themselves. (This is also the etymological source of the name of the Barbary Coast, the Berber people, and other similar terms as well.)
But what all this means it that essentially, the English word "barbarian" means "a person who says blah, blah, blah."