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Family name Clancy (Clancy
) , across the world, is a common last name. The surname Clancy is characteristic of Northern Europe, particularly Ireland, where it is quite a common surname, Guernsey, and Jersey (explore the name in all countries). Not in comparison with a country's population, the name is most common in the United States, Ireland, and Australia. Very seldom, Clancy is the forename as well as the last name.