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Cognomen Decha (เดชา , Decha , Деша ) , worldwide, is quite a common surname. The family name Decha is habitual in Bulgaria, where it is quite a common surname, Thailand, where it is quite a rare surname, and Ethiopia, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Thailand, Bulgaria, and Indonesia. More frequently, Decha is the forename as well as the last name.