Cognomen Kazumasa (Kazumasa 
, カズマサ , คาซึมาสะ 
) , throughout the world, is a common last name. The family name Kazumasa is habitual in Japan, where it is quite a common surname, Hong Kong, where it is a rare surname, and Hungary. Not in comparison with a country's population, it most frequently occurs in Eastern Asia, particularly Japan, China, and Hong Kong. Much less frequently, Kazumasa is the forename as well as the last name.