Schmuck is indeed Yiddish, but it's a word rather than a name (albeit a word often applied to people) which comes from the European Jewish language known as Yiddish. It's definitely not a word to use when among polite company, however, due to it referring to - erm - the male member.
Schmuck as a surname is not Jewish. It is a German name meaning "Jewel".
[Note: the Yiddish word Schmuck is not related to the German word Schmuck. In fact, the are not even pronounced the same]
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