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Family name Barclay (Barclay , باركلي, Барклай ) , worldwide, is a common surname. The surname Barclay is characteristic of Liberia, where it is quite a common surname, Jamaica, and Trinidad and Tobago (explore the name in all countries). Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Australia. Much less frequently, Barclay is the forename as well as the last name.