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In the entire world, せいじ (Seiji , せいじ) is quite a rare boy's first name. The forename せいじ is characteristic of Japan, where it is a rare masculine name, Australia, where it is a very rare boy's name, and Canada. Not in comparison with a country's population, it most frequently occurs in Japan, China, and the United States. Likewise, せいじ is the last name as well as the forename.
せいじ is also a name for the fictitious and mythical characters: Seiji Amasawa , character in Whisper of the Heart and Seiji Iwaki , the fictional character from Initial D.