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Surname Tomio (Tomio , トミオ , 富夫 ) , in all the world, is quite a common last name. The last name Tomio is habitual in Japan, where it is quite a rare surname, Brazil, where it is a rare surname, and Austria. Measured by absolute frequency, the name is most common in Japan, Brazil, and Italy. Much less frequently, Tomio is the forename as well as the last name.