I'll try to get hold of the article Seibicke quotes. There must be something to it, as even the Duden "Das große Vornamen-Lexikon" (formerly "Lexikon der Vornamen" and one of the most reliable name books in Germany) changed this entry in its last edition. I'll keep you posted on this. Well, my last post was not well placed so I decided to put it on the board again. Thanks for answering.