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Throughout the world, Seiji (Seiji , Сэйдзи , Сэидзи, along with others...) is quite a rare masculine given name. The first name Seiji is habitual in Japan, where it is a rare male name, Australia, where it is a very rare male name, and Canada. Not in comparison with a country's population, it is the most numerous in Japan, China, and the United States. Also, Seiji is the last name as well as the forename.
Seiji 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.