Busilacchi, quite rare, is specific to Loreto nell'anconetano, Buslacchi, also very rare, is typical of Novara, it should be cumulative forms (those of the) in -acchi related to a dialectal variation of the Latin cognomen Bucius or Buccius, but it is also possible a derivation from nicknames originated from the term busillis (thorny problem and difficult to solve, crucial point).
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