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Last name Rosun (Rosun , โรซัน ) , in the entire world, is a rare surname. The family name Rosun is habitual in Mauritius, where it is quite a common surname, New Zealand, where it is a rare surname, and Bangladesh, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Mauritius, Bangladesh, and the United Kingdom. Also, Rosun is the forename as well as the last name.