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In all the world, Масару (Masaru , 長 , 勝 ) is quite a common epicene forename. The first name Масару is characteristic of Japan, where it is quite a rare boy's name, India, where it is a rare gender-neutral name, and Brazil, where it is a rare boy's name. Also, Масару is the last name as well as the forename.
Масару is also a name for the fictitious and mythical characters: Guan Sheng , the Chinese novel Water Margin fictional character; Masaru Suzuki , the Virtual YouTuber; Masaru Aso , the fictional character of Kamen Rider ZO; Masaru Kato , character in Gantz and Masaru Aoki , the fictional character in Hajime no Ippo, among other works.