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Last name Briley (Briley , بريلي, בריילי ) , around the world, is quite a common surname. The family name Briley is characteristic of the United States, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and New Zealand. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Canada. Much less frequently, Briley is the forename as well as the last name.