The literal Babylon was an ancient city situated on the euphrates river.
Originally Ea appears to have been a fish--the incarnation of the spirit of, or life principle in, the euphrates river.
Perhaps some years ago it had formed actually the bed of the euphrates river, which had then flowed over and through it.
Its eastern shore is within a hundred miles of the headwaters of the euphrates river, which is navigable for small craft to Bir.
It was situated southwest of the euphrates river, near the plains which were the nation's chief grazing grounds.
Old English Eufrate, from Greek Euphrates, from Old Persian Ufratu, perhaps from Avestan huperethuua "good to cross over," from hu- "good" + peretu- "ford." But Kent says "probably a popular etymologizing in O.P. of a local non-Iranian name" ["Old Persian," p.176]. In Akkadian, purattu.