Cognomen Kazuo (Kazuo 
, カズオ , Казуо 
, along with others...) , in all the world, is a common last name. The cognomen Kazuo is habitual in Japan, where it is quite a common surname, Taiwan, where it is a rare surname, and Malaysia. Not in comparison with a country's population, it most frequently occurs in Japan, China, and Indonesia. Much less frequently, Kazuo is the forename as well as the last name.