etymology of Eridanus

From: Michael Smith
Message: 34964
Date: 2004-11-05

Does anyone know the etymology of Eridanus? I'm assuming, from
what I've been told, that it is a word of Celtic origin. As it
appears in early Greek mythology (Hesiod, for example), the Greeks
must have known about this river in southern Gaul pretty early on,
and so could this be considered an early Celtic loanword into Greek?

-Michael