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Cognomen Byrne (伯恩 , Byrne , بيرن , and others...) , around the world, is a widespread last name. The cognomen Byrne is habitual in Northern Europe, particularly Ireland, where it is a widespread surname, Guernsey, where it is a common surname, and Jersey, where it is quite a common surname (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Ireland, the United States, and the United Kingdom. Very seldom, Byrne is the forename as well as the last name.