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Last name イガラシ (イガラシ , Igarashi , Igarasi ) , all around the world, is quite a rare cognomen. The family name イガラシ is habitual in Taiwan, where it is quite a rare surname, Singapore, and Hong Kong. Measured by absolute frequency, it most frequently occurs in Japan, Brazil, and Taiwan. More frequently, イガラシ is the forename as well as the last name.