Yeah, I've heard them referred to as liquor in most United State'ian films throughout my life. It never caught on in the UK because it's still the term given to a blue substance used for cleaning the brushes and combs of hair-care professionals (though the term is dying out as it gets more scarcely used).
I always assumed it came from "liqueurs", which are alcoholic syrups which are often encased in chocolates.
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