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Last name Gei (Jay , Gei , Гей ) , around the world, is a widespread surname. The cognomen Gei is characteristic of British Virgin Islands, where it is quite a common surname, Brunei, and Jamaica (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in India, Indonesia, and the United States. More frequently, Gei is the forename as well as the last name.