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Cognomen 海 (海 , Hai , Hay ) , globally, is a widespread family name. The surname 海 is characteristic of Jersey, where it is a common surname, Malaysia, where it is quite a common surname, and Jamaica (explore the name in all countries). Measured by absolute frequency, this name is the most popular in China, Malaysia, and Vietnam. Also, 海 is the forename as well as the last name.