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All around the world, Tetsuo (哲夫 , Tetsuo , テツオ , and others...) is quite a rare boy's first name. The first name Tetsuo is habitual in Japan, where it is a rare male name, China, and the United States, where it is a very rare male name. More frequently, Tetsuo is the last name as well as the forename.
Tetsuo 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.