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Family name Дэй (Day , Daye , Дэй ) , in the entire world, is a widespread cognomen. The family name Дэй is characteristic of Marshall Islands, where it is a widespread surname, Jersey, where it is a common surname, and the United Kingdom, where it is quite a common surname (explore the name in all countries). In absolute terms, it most frequently occurs in the United States, the United Kingdom, and Myanmar. Much less frequently, Дэй is the forename as well as the last name.