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All over the world, まさひろ (Masahiro , まさひろ) is quite a rare masculine first name. The given name まさひろ is characteristic of Japan, where it is quite a rare boy's name, Hong Kong, where it is a rare boy's name, and Chile, where it is a very rare boy's name. Not in comparison with a country's population, it most frequently occurs in Japan, China, and Indonesia. Likewise, まさひろ is the last name as well as the forename.
まさひろ 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.