Last name Koulch (Кульш 
, Koulch) , across the world, is a very rare cognomen. The last name Koulch is habitual in Belarus, where it is a rare surname, Ukraine, where it is a very rare surname, and Kazakhstan. Not in comparison with a country's population, the name is most common in Eastern Europe, particularly Belarus, Ukraine, and Russia. Very seldom, Koulch is the forename as well as the last name.