Stories We Like: A Guide to the Comma
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: Charlatanism; charlatanical; charlatanry.
charlatan char·la·tan (shär'lə-tən)
A person fraudulently claiming knowledge and skills not possessed.