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Last name Iwasaki (イワサキ , Iwasaki , 岩崎 ) , all around the world, is quite a rare cognomen. The family name Iwasaki is characteristic of Japan, where it is quite a rare surname, Singapore, where it is a rare surname, and Belgium. Measured by absolute frequency, it is commonest in Japan, the United States, and Brazil. More frequently, Iwasaki is the forename as well as the last name.