I just double-checked up on Old Irish Danae
(Dana/Dane) - the actual meaning is "impudent/bold" (thus closer to Gaulish Dan-
"violent") and not "swift" - sorry about that, but I confused it with a similar
root.
-Chris Gwinn
So
far, leaving aside river and divine names, we have come up with : Old Indic
/dhanu/ - dew, dripping water Ossetic /don/ - river Gaulish /dan/ -
violent Irish /danae/ - swift