Family name Gasaj (Gasaj 
, Гасай 
) , all around the world, is a rare last name. The surname Gasaj is characteristic of Slovakia, where it is quite a rare surname, Ukraine, where it is a rare surname, and Kazakhstan. In absolute terms, it is the most numerous in Eastern Europe, particularly Ukraine, Slovakia, and Russia. Much less frequently, Gasaj is the forename as well as the last name.