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Last name origins & meanings:

1. German and Jewish (Ashkenazic): nickname for someone with a copious or otherwise noticeable head of hair, from Middle High German hār ‘hair’, German Haar ‘hair’.
2. German: metonymic occupational name for someone who worked with raw flax (Middle High German har) in the production of linen.
3. North German and Dutch: topographic name for someone who lived by a swamp, from Middle Low German hōr, hār ‘dirt’, ‘mud’.
4. Probably a shortened form of Dutch van Haar, a habitational name for someone from Ter Haar in Groningen or any of three places named De Haar (in Drente, Overijssel, and Gelderland).