With the discovery and decipherment of ancient Babylonian and Sumerian texts in the 19th century a theory was offered that the name of the river constellation Eridanus, which appears in the poem Phaenomena by Aratus in the 3rd century BC, was due to the ancient Sumerian city Eridu.
A far more likely origin of the name, to me, would seem to be the IE river deity name/word *danu, which has provided names to a number of rivers known to the Greek world (like Danube), and at least one Celtic river deity.
Can anyone through any light on this subject? Does "Eridanus" look like an IE derivation?
(One problem with the "Eridu" theory is that how it might be transmitted to Greece is quite mysterious. The Greeks got their Zodiacal constellations, and others nearby in the sky, from the Late Babylonians. But there is no constellation in any Babylonian texts corresponding to Eridanus or bearing that or a similar name. Somehow knowledge of a Sumerian city name lost circa 2000 BC would have to be transmitted to Greece 1700 years later, without leaving a trace in Babylonian texts.)