Random Tolkien Thought

I am reading a history of the Northern Crusades against the Baltic pagan tribes in the 12th through 15th centuries and I was interested to discover that the Wends, a Slavic tribe that lived in what is now eastern Germany, worshiped a forest god named Radigost.

Now considering J.R.R. Tolkien had more than a passing interest in the Baltic region, especially the Finns and Finnish language and literature, I wonder if Radigost is the source for the wizard Radagast the Brown?  After all Tolkien was not above stealing names wholesale from medieval literature.  Gandalf and all the dwarves' names from The Hobbit can be found in the Icelandic Prose Edda.  And  Radigost was a forest god it makes and Radagast was a wizard who lived in Mirkwood, so there is that similarity.

I can't prove any of it, but it makes sense to me.

An Epic Tale, Part I

And it came to pass that when Thagwald the Incontinent was king, there came out of the Plaid Hills a barbarian hero of great skill and renown. The hero strode into the small town of P’Tang, sweat glistening of his mighty thews and when he reached the square at the center he drew his sword and cried, “I seek brave souls to help me overthrow the Seven Lords of Lower Cromden!”

The only denizen of the town square, a rather bored looking cow chewing her cud, looked askance at the barbarian.