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Last name Cornwall (Cornwall ) , throughout the world, is quite a common surname. The cognomen Cornwall is characteristic of Latin America and the Caribbean, particularly Grenada, where it is a common surname, Antigua and Barbuda, where it is quite a common surname, and Jamaica (explore the name in all countries). In absolute terms, it is commonest in the United States, the United Kingdom, and Jamaica. Much less frequently, Cornwall is the forename as well as the last name.