Surname Kazunao (一直 
, Kazunao 
) , in all the world, is a rare last name. The cognomen Kazunao is habitual in Japan, where it is a very rare surname, Spain, and China, where it is an extremely rare surname. Much less frequently, Kazunao is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 一直 | China |
| Kazunao | Brazil, Spain, China, United States, Japan |