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Hiddekel

R.H. Allen , Starnames, Their Lore and Meaning, , [1990], 475, Galaxy, or Milky Way; Brown writing of this: 45. Akkadian Hid tsirra, Assyrian Nahru tsiri, = "River-of-the-Snake". Thus Hiddagal, "River" + "great" = Hiddekel (Gen. ii, 14).
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Among the Arabs it was Al Nahr, the River, a title that they afterwards transferred to the Greek constellation Eridanus; and those other Semites, the Hebrews, knew it as Nɛhar di Nur, the River of Light.
David J. Gibson , The Land of Eden Located, Hiddekel, The River Hiddekel
"The name of the third river is Hiddekel: that is it which goeth to the east of Assyria." Genesis 2:14. The third river-head is almost as easy to identify as the fourth. While not everyone reading English will immediately recognize the name "Hiddekel,'yet scholars are quite in agreement about it. It is the modern "Tigris."
Those ancient Sumerians called the Tigris, "Idikna" or "Idikla." The early Semitic people called it, "Idiklat" (in Hebrew,"Hiddekel,"), later shortened to "Diklat." The Persians pronounced it, "Tigra," from whence the classical Greek name came, "Tigris." Today, in Arabic it is, "Dijla." Once again, these are but variants of one name retained throughout all history. This identification is upon firm ground. To make the identification doubly sure, the Tigris is definitely the river of Assyria. The Assyrian capital city Nineveh stood upon that river's banks.