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Cognomen Joule (Julio , Joule , جول ) , in all the world, is a widespread family name. The surname Joule is habitual in Latin America and the Caribbean, particularly Nicaragua, where it is a widespread surname, Mexico, where it is a common surname, and Honduras (explore the name in all countries). In absolute terms, it is commonest in Mexico, Spain, and Venezuela. More prevalently, Joule is the forename as well as the last name.