Cognomen Koulech (Кулеш 
, Koulech 
) , across the world, is quite a common family name. The surname Koulech is habitual in Belarus, where it is quite a common surname, Russia, where it is quite a rare surname, and Kazakhstan. In absolute terms, this name is the most popular in Eastern Europe, particularly Belarus, Russia, and Ukraine. Very seldom, Koulech is the forename as well as the last name.