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Cognomen Blah (Blah , Бла , Blasé ) , around the world, is quite a common last name. The surname Blah is habitual in Liberia, where it is quite a rare surname, Tajikistan, and Philippines, where it is a rare surname. Measured by absolute frequency, it is the most numerous in India, Philippines, and Liberia. Very seldom, Blah is the forename as well as the last name.