English speakers are fond of forming new words through reduplication of a base word, usually with just a slight change of sound. Think of okeydoke, fuddy-duddy, super-duper, roly-poly, fiddle-faddle, and dillydally. Another word is razzle-dazzle, formed by the reduplication of dazzle (itself a frequentative of daze). In the late-19th century, the spirit that prompted razzle-dazzle (one early meaning of which is "a state of confusion or hilarity") seems to have also inspired razzmatazz. The coiners of razzmatazz may also have had jazz in mind. Some of the earliest turn-of-the century uses of razzmatazz refer to rag-time or early jazz styles. By the mid-20th century, we'd come round to the "razzle-dazzle" sense, though we still haven't completely settled on the spelling. You might, for example, see razzamatazz.