Wikipedia 情報で恐縮だけど「つぶやく」という意味の方言からきてるらしいよ。

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The name comes from the old German words lureln, Rhine dialect for "murmuring", and the Celtic term ley "rock". The translation of the name would therefore be "murmur rock" or "murmuring rock".
ttps://en.wikipedia.org/wiki/Lorelei
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