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Last name origins & meanings:

1. English, German, and Jewish (Ashkenazic): metonymic occupational name for a maker of sacks or bags, from Old English sacc, Middle High German sack, German Sack ‘sack’. Bahlow also suggests someone who carried sacks.
2. German: topographic from Middle High German sack ‘sack’, ‘end of a valley or area of cultivation’.
3. Dutch: from a reduced form of the personal name Zacharias.
4. Jewish (eastern Ashkenazic): from an acronym of the Hebrew phrase Zera Keshodim ‘Seed of the Holy’ (referring to martyred ancestors), or from a short form of the personal name Isaac.