Last name Gajusz (Гай 
, Gajusz) , around the world, is quite a rare cognomen. The cognomen Gajusz is habitual in Ukraine, where it is quite a rare surname, Armenia, where it is a rare surname, and Russia. In absolute terms, this name is the most popular in Ukraine, Russia, and Kazakhstan. Very seldom, Gajusz is the forename as well as the last name.