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Surname Sinchai (สินชัย , ศิลป์ชัย , Sinchai , along with others...) , around the globe, is quite a rare last name. The cognomen Sinchai is characteristic of Thailand, where it is quite a rare surname, Singapore, where it is a rare surname, and Australia, where it is a very rare surname. Measured by absolute frequency, it is commonest in Thailand, Singapore, and the United States. More prevalently, Sinchai is the forename as well as the last name.