All over the world, Оку (奥 
, Oku 
, Okou 
) is a common epicene first name. The first name Оку is habitual in Nigeria, where it is quite a rare epicene name, China, where it is a rare unisex name, and Kazakhstan, where it is a rare principally feminine, but very infrequently masculine name. Measured by absolute frequency, the name is most common in China, Nigeria, and Ethiopia. Also, Оку is the last name as well as the forename.