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Surname Riley (Riley , رايلي , Райли , and others...) , worldwide, is a widespread family name. The cognomen Riley is characteristic of Jamaica, where it is a common surname, Isle of Man, where it is quite a common surname, 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, the United Kingdom, and Australia. Much less frequently, Riley is the forename as well as the last name.