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Surname Duncan (Duncan , ダンカン , 邓肯 , and others...) , worldwide, is a widespread cognomen. The last name Duncan is characteristic of Latin America and the Caribbean, particularly Grenada, where it is a common surname, Saint Vincent and the Grenadines, and Jamaica (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 Australia. Likewise, Duncan is the forename as well as the last name.