Throughout the world, Osaku (Osaku 
) is a very rare unisex forename. The first name Osaku is habitual in Nigeria, where it is a very rare epicene name, and India, where it is an extremely rare boy's name. Very seldom, Osaku is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Osaku | Brazil, Nigeria, India, Japan |