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Laelaps was a mythical hunting dog that could always catch its prey. The name comes from Greek λαῖλαψ, "hurricane".
But where does this word come from? LSJ doesn't provide an etymology, and Wiktionary doesn't even have a page for it.
"Pre-Greek" according to Beekes.
Lailaps is found in the New Testament. Textual studies of the Bible suggest its etymology to be "uncertain" (e.g. here).
Meanwhile, this site has this:
Required, but never shown