Surname Gisko (Gisko 
, Гиско 
) , across the world, is a rare family name. The last name Gisko is habitual in Eastern Europe, particularly Belarus, where it is quite a rare surname, Hungary, where it is a rare surname, and Poland, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Eastern Europe, particularly Belarus, Poland, and Russia. Very seldom, Gisko is the forename as well as the last name.