What is the origin of tchotchke?

Tchotchke “an inexpensive souvenir, trinket, or ornament” is a borrowing of Yiddish tshatshke, from obsolete Polish czaczko “toy, trinket” (modern Polish cacko), which is cognate with Czech čačka and Russian cacka, of the same general meaning. These Slavic terms are all most likely of imitative origin; with the addition of the diminutive suffix -ka or -ko, the original forms (Czech čača and both Polish and Russian caca) appear to be reduplicated syllables that are typical of baby talk. In case you thought it was a little strange that a word for “toy” or “trinket” would derive from a doubled syllable, bear in mind that English contains the similarly reduplicated term knickknack. Tchotchke was first recorded in English in the late 1960s.