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Last name 柴 (Chai , 柴 , Саи ) , across the world, is a widespread surname. The surname 柴 is habitual in Malaysia, where it is a common surname, British Virgin Islands, and Singapore (explore the name in all countries). Measured by absolute frequency, this name is the most popular in China, Malaysia, and Indonesia. Very seldom, 柴 is the forename as well as the last name.