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In all the world, カズヤ (Kazuya , カズヤ ) is quite a rare boy's first name. The given name カズヤ is habitual in Japan, where it is quite a rare boy's name, Indonesia, where it is a rare mostly masculine, but uncommonly feminine name, and Belgium, where it is a very rare boy's name. In absolute terms, it is commonest in Japan, Indonesia, and China. Predominantly, カズヤ is the last name as well as the forename.
カズヤ is also a name for the fictitious and mythical characters: Kazuya Mishima , the fictional character from Tekken, Tekken 7; Kazuya Oki , the Fictional character of Kamen Rider Super-1; Kazuya Hiramaru , character in Bakuman; Kazuya Uesugi , character in Touch and Kazuya Hara , the character from Kuroko's Basketball.