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Worldwide, マサヒロ (Masahiro , マサヒロ ) is quite a rare boy's first name. The first name マサヒロ is characteristic of Japan, where it is quite a rare masculine name, Hong Kong, where it is a rare boy's name, and Chile, where it is a very rare masculine name. Measured by absolute frequency, it is the most numerous in Japan, China, and Indonesia. More frequently, マサヒロ is the last name as well as the forename.
マサヒロ is also a name for the fictitious and mythical characters: Masahiro Shibata , the fictional character from Erast Fandorin series; Masahiro Adachi , the Working!!'s character; Masahiro Mashiro , character in Bakuman and Masahiro Tsubuku , the character from Kuroko's Basketball.