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Family name Irish (Irish , Irisce , Ír ) , around the world, is a common surname. The last name Irish is characteristic of Antigua and Barbuda, where it is quite a common surname, Aland Islands, and Saint Kitts and Nevis (explore the name in all countries). In absolute terms, it is the most numerous in the United States, the United Kingdom, and Ireland. More prevalently, Irish is the forename as well as the last name.