Cognomen カズ (Kazu 
, Kaz 
, カズ ) , in all the world, is a common family name. The surname カズ is habitual in Bahrain, where it is quite a rare surname, Turkey, and Japan. Not in comparison with a country's population, it most frequently occurs in Japan, Turkey, and Pakistan. Also, カズ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kazu | Malaysia, Australia, Japan, Indonesia, Turkey |
| Kaz | Australia, Algeria, Japan, Pakistan, Turkey |
| カズ | Japan |
| Yuzuki | Brazil, China, Myanmar, United States, Japan |