Cognomen Kazuya (Kazuya 
, カズヤ , Казуя 
, along with others...) , in all the world, is a common family name. The surname Kazuya is characteristic of Japan, where it is quite a common surname, Indonesia, where it is a rare surname, and Singapore. In absolute terms, it most frequently occurs in Japan, Indonesia, and China. Very seldom, Kazuya is the forename as well as the last name.