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Cognomen Medlyn (Medlyn ) , around the globe, is a rare last name. The surname Medlyn is habitual in Australia, where it is a rare surname, the United Kingdom, and Canada, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Australia. Likewise, Medlyn is the forename as well as the last name.