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In all the world, Масааки (Seiyo , Masaki , Masaaki ) is a common male first name. The given name Масааки is characteristic of Japan, where it is quite a rare male name, Brazil, where it is a rare boy's name, and Austria. Measured by absolute frequency, this name is the most popular in Japan, China, and Brazil. Likewise, Масааки is the last name as well as the forename.
Масааки is also a name for the fictitious and mythical characters: Masaki Uehara , the Ao-chan Can't Study!'s character; Masaaki Nakatani , the character from Kuroko's Basketball and Masaki Mayuka , character in Tenchi Muyo!.