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Surname Kongchai (Kongchai , คงชัย , คงไชย ) , worldwide, is quite a rare family name. The surname Kongchai is characteristic of Thailand, where it is quite a rare surname, New Zealand, where it is a very rare surname, and Cambodia. In absolute terms, it is commonest in Thailand, the United States, and New Zealand. Much less frequently, Kongchai is the forename as well as the last name.