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Surname ดอย (Doi , Doei , ดอย ) , throughout the world, is a common last name. The cognomen ดอย is characteristic of Myanmar, where it is quite a common surname, Netherlands, where it is quite a rare surname, and Malaysia. Measured by absolute frequency, it is commonest in Myanmar, India, and the United States. Also, ดอย is the forename as well as the last name.