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Last name เบญจกุล (เบญจกุล , Benjakul , Benyakul ) , around the world, is quite a rare surname. The family name เบญจกุล is habitual in Thailand, where it is quite a rare surname, and the United States, where it is an extremely rare surname. Very seldom, เบญจกุล is the forename as well as the last name.