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Last name origins & meanings:

  1. English: evidently from Old English blōd ‘blood’, but with what significance is not clear. In Middle English the word was in use as a metonymic occupational term for a physician, i.e. one who lets blood, and also as an affectionate term of address for a blood relative.
  2. Welsh: Anglicized form of Welsh ap Llwyd ‘son of Llwyd’ (see Lloyd).