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Last name origins & meanings:

1. Arabic (Egypt and Syria): probably from a personal name based on the Arabic root ḅtr ‘wild’ or ‘proud’.
2. Possibly an altered spelling of French Bitard, from a noun derivative of Middle French bite (from Old Norse biti ‘tooth’), later ‘piece of wood’, ‘tiller’, used as a nickname for a surly man, or possibly an occupational name for a boatman.