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Cognomen Casian (Casian , Цасян ) , around the globe, is quite a rare surname. The surname Casian is characteristic of Moldova, where it is quite a common surname, Romania, where it is quite a rare surname, and Tanzania, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Romania, Moldova, and Mexico. Also, Casian is the forename as well as the last name.