Know how to use "fewer" and "less"? Find out.
c.1600, from French fanfare, from fanfarer "blow a fanfare," perhaps echoic, or perhaps borrowed (with Spanish fanfarron "braggart," and Italian fanfano "babbler") from Arabic farfar "chatterer," of imitative origin.
originally a brief musical formula played on trumpets, horns, or similar "natural" instruments, sometimes accompanied by percussion, for signal purposes in battles, hunts, and court ceremonies. The term is of obscure derivation