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Surname Sheridan (Sheridan , שרידן , Шеридан ) , globally, is a common last name. The cognomen Sheridan is habitual in Northern Europe, particularly Ireland, where it is a common surname, Guernsey, where it is quite a common surname, and Jersey (explore the name in all countries). Measured by absolute frequency, this name is the most popular in the United States, the United Kingdom, and Ireland. Very seldom, Sheridan is the forename as well as the last name.