Writers, poets etc. are often described as "inventing" names when in fact they have gone back to obscure sources and revived one, or just happened to create the same name in the same way. As is always the way, I can't think of examples just now, but I'm sure that when doing a project on etymology a year ago, I found earlier examples of many names Shakespeare supposedly created. BtN is one of the best websites, and in fact better than most books as well, but every source has its little inaccuracies and in this case I'd go with the medieval page.
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