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Cognomen デイ (Day , Dae , Dey , and others...) , around the globe, is a prevalent family name. The last name デイ is characteristic of Marshall Islands, where it is a widespread surname, India, where it is a common surname, and Jersey (explore the name in all countries). Measured by absolute frequency, it is the most numerous in India, Bangladesh, and the United States. Very seldom, デイ is the forename as well as the last name.