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Worldwide, テツオ (Tetsuo , テツオ , Tetuo ) is quite a rare boy's forename. The first name テツオ is habitual in Japan, where it is a rare boy's name, Brazil, where it is a very rare boy's name, and the United States. Not in comparison with a country's population, it is the most numerous in Japan, China, and Brazil. More frequently, テツオ is the last name as well as the forename.
テツオ is also a name for the fictitious and mythical characters: Tetsuo Shima , the fictional character from Akira; Tetsuo Takahashi , the fictional character from Interviews with Monster Girls and Tetsuo Ishizu , the KochiKame characters, Kochira Katsushika-ku Kameari Kōen-mae Hashutsujo.