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Cognomen Brash (Brash , براش , Браш ) , in all the world, is quite a rare surname. The cognomen Brash is characteristic of Palestinian Territory, where it is quite a rare surname, New Zealand, and Trinidad and Tobago. In absolute terms, it most frequently occurs in the United Kingdom, the United States, and Palestinian Territory. Very seldom, Brash is the forename as well as the last name.