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Cognomen Cain (Cain , كين , ケイン ) , in the entire world, is a common surname. The surname Cain is characteristic of Saint Vincent and the Grenadines, where it is a common surname, Isle of Man, where it is quite a common surname, and Barbados (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in the United States, the United Kingdom, and Mexico. Much less frequently, Cain is the forename as well as the last name.