Surname Kohaku (Kohaku 
) , in the world, is a rare cognomen. The surname Kohaku is characteristic of Japan, where it is a rare surname, Indonesia, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, Kohaku is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kohaku | Japan, Indonesia, Russia, United States, Brazil |