The Origin of the River Niper in Eastern Europe

There's a whole bunch of rivers in eastern europe that are named don danube, nip nister, donesk. And the linguistic origin of all of these rivers is the word danu, the river goddess. So it looks like these river names that trace the eastward migration of a bunch of people who worshipped this river goddess danu. Maybe it was the danovas who were expelled out of in forced our force into a permanent exile. And they went westwards gradually. Whatever great river they found, they named it after their ancestor, the great lady dan rit.