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Surname Mccoy (Mccoy , マッコイ , מקוי , among others...) , worldwide, is a widespread last name. The surname Mccoy is characteristic of Antigua and Barbuda, where it is quite a common surname, the United States, and Ireland (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in the United States, the United Kingdom, and Canada. Very seldom, Mccoy is the forename as well as the last name.