Tolkien's invented history would predate any tales of the Brothers Grimm etcetera. Maybe it's possible that the Grimm Fairy Tale was supposed to emulate the actual story of the Seven Fathers of the Dwarves? Whacky, I know. At least now we could finally hazard a guess at the names of all the Fathers: Durin, Grumpy, Sleepy...
Also, I think "Unoriginality" might have been a little off as the discussion topic. Tolkien borrowed from other myths in order to bring his invented world more in line with traditional mythology, and to renew appreciation for the great works. NOT because he was short on ideas.
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But Gwindor answered: 'The doom lies in yourself, not in your name'.
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