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Surname Ikuo (平山 , Ikuo , イクオ ) , around the world, is quite a common family name. The cognomen Ikuo is habitual in Japan, where it is quite a rare surname, China, where it is a rare surname, and Tanzania, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Japan, China, and Nigeria. Also, Ikuo is the forename as well as the last name.