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Cognomen Citron (Citroen , Citron , Citrons ) , in the world, is quite a rare surname. The last name Citron is characteristic of Aruba, where it is quite a common surname, Martinique, and Israel, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in the United States, France, and Italy. Much less frequently, Citron is the forename as well as the last name.