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Cognomen Tsuba (Tsuba , Цуба , 鍔 ) , around the world, is quite a rare surname. The family name Tsuba is habitual in Belarus, where it is quite a rare surname, Japan, where it is a rare surname, and Kazakhstan. Measured by absolute frequency, this name is the most popular in Japan, Belarus, and Russia. Much less frequently, Tsuba is the forename as well as the last name.