Tartuffe (n.)

"pretender to piety," 1670s, from name of the principal character in the comedy by Molière (1664), apparently from Old French tartuffe "truffle" (see truffle), perhaps chosen for suggestion of concealment (Tartuffe is a religious hypocrite), or "in allusion to the fancy that truffles were a diseased product of the earth." Italian Tartufo is said to have been the name of a hypocritical character in Italian comedy.