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Surname Achan (Achan , อาชัญ , Ашан ) , in all the world, is quite a rare cognomen. The surname Achan is habitual in Uganda, where it is quite a rare surname, Trinidad and Tobago, and United Arab Emirates. Measured by absolute frequency, it is the most numerous in Uganda, India, and Indonesia. Also, Achan is the forename as well as the last name.