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Surname Achai (Achai , อาชัย , Ачай ) , globally, is a rare cognomen. The cognomen Achai is characteristic of Malaysia, where it is a rare surname, Indonesia, where it is a very rare surname, and Israel. Not in comparison with a country's population, it is the most numerous in Malaysia, Indonesia, and Nigeria. More frequently, Achai is the forename as well as the last name.