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Surname Allanson (Allanson , بارون ) , all around the world, is quite a rare family name. The cognomen Allanson is characteristic of Australia, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and New Zealand. Measured by absolute frequency, it is the most numerous in the United Kingdom, the United States, and Australia. Very seldom, Allanson is the forename as well as the last name.