Surname Kotaku (Kotaku 
) , around the world, is a rare cognomen. The surname Kotaku is habitual in Japan, where it is a very rare surname, Indonesia, and India, where it is an extremely rare surname. More frequently, Kotaku is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kotaku | Myanmar, India, Japan, Nigeria, Indonesia |