Cognomen Косукэ (Kosuke 
, Kousuke 
, Косукэ) , in the entire world, is a rare surname. The last name Косукэ is characteristic of Singapore, where it is a rare surname, Japan, and Indonesia, where it is a very rare surname. Not in comparison with a country's population, it is commonest in China, Japan, and Indonesia. More prevalently, Косукэ is the forename as well as the last name.