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Last name origins & meanings:

1. Catalan (Sàbat): from a nickname or personal name bestowed on someone born on a Saturday, which was considered a good omen (Late Latin sabbatum, Greek sabbaton, from Hebrew shabat ‘Sabbath’).
2. Jewish (Ashkenazic): ornamental name from German Sabbat ‘Sabbath’.
3. French: nickname for a noisy, rowdy person, from Middle French sab(b)at ‘noise’, ‘racket’.