Charlatan

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early 17th century (denoting an itinerant seller of supposed remedies): from French, from Italian ciarlatano, from ciarlare ‘to babble’.

wiktionary

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From Middle French charlatan, from Old Italian ciarlatano(“quack”), a blend of ciarlatore(“chatterer”) + cerretano(“hawker, quack”, literally “native of Cerreto”) ( Cerreto di Spoleto being a village in Umbria, known for its quacks).

etymonline

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charlatan (n.)

"one who pretends to knowledge, skill, importance, etc.," 1610s, from French charlatan "mountebank, babbler" (16c.), from Italian ciarlatano "a quack," from ciarlare "to prate, babble," from ciarla "chat, prattle," perhaps imitative of ducks' quacking. Related: Charlatanical.