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Surname Dagan (Dagan , דגן , Даган , among others...) , globally, is a common cognomen. The surname Dagan is characteristic of Israel, where it is quite a common surname, British Virgin Islands, and Djibouti. Measured by absolute frequency, it is the most numerous in Israel, Philippines, and Benin. Much less frequently, Dagan is the forename as well as the last name.