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Last name Castin (جاستن , Castin , ஜஸ்டின்) , in the world, is quite a rare cognomen. The cognomen Castin is habitual in Sudan, where it is quite a rare surname, Haiti, and Belgium. Measured by absolute frequency, it is the most numerous in Sudan, Philippines, and France. Also, Castin is the forename as well as the last name.