As mentioned before, this is a rare name of a common character. The name is mentioned in Book 1, as is the lonely one, and the eccentric cousin, and the assault. The clue is a play on words of sorts.
Perhaps it might be easier to work backwards, knowing that this is a major character who is reasonably close to Elrond.
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You passed from under darkened dome, you enter now the secret land. - Take me to Finrod's fabled home!... ~ Finrod: The Rock Opera
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