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Last name イワオ (Iwao , イワオ ) , worldwide, is quite a common cognomen. The surname イワオ is habitual in Japan, where it is quite a rare surname, Singapore, where it is a rare surname, and Malaysia, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Japan, China, and the United States. Likewise, イワオ is the forename as well as the last name.