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Surname Briar (Briar , بريار , หนาม ) , throughout the world, is quite a rare cognomen. The surname Briar is characteristic of Western Europe, particularly Belgium, where it is quite a rare surname, Luxembourg, and France, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Belgium, the United States, and France. Also, Briar is the forename as well as the last name.