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Cognomen Sanlai (Sanlai , ซันไล ) , across the world, is a very rare surname. The cognomen Sanlai is characteristic of Thailand, where it is a very rare surname, Malaysia, where it is an extremely rare surname, and Nigeria. In absolute terms, the name is most common in Thailand, China, and Nigeria. More prevalently, Sanlai is the forename as well as the last name.