In the entire world, Koulian (Кулян 
, Koulian 
, Кульян ) is quite a rare girly forename. The first name Koulian is habitual in Kazakhstan, where it is quite a common girly name, Kyrgyzstan, where it is a rare female name, and Russia, where it is a very rare feminine name. Much less frequently, Koulian is the last name as well as the forename.