In all the world, コウチヤマ (コウチヤマ , Kochiyama ) is an extremely rare unknown gender first name. Very seldom, コウチヤマ is the last name as well as the forename.
Kouchiyama
カイリ, and タクヤ
, Kochiyama 
) is an extremely rare unknown gender first name. Very seldom, コウチヤマ is the last name as well as the forename.