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Last name タダオ (Tadao , タダオ ) , around the globe, is quite a common surname. The surname タダオ is habitual in Japan, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Philippines. Measured by absolute frequency, the name is most common in Japan, Philippines, and China. Much less frequently, タダオ is the forename as well as the last name.