Surname Гюндюз (Gündüz 
, Гюндюз 
, Giundiuz 
) , all around the world, is a widespread last name. The family name Гюндюз is habitual in Western Asia, particularly Turkey, where it is a common surname, Cyprus, where it is quite a rare surname, and Azerbaijan. Not in comparison with a country's population, this name is the most popular in Turkey, Germany, and Azerbaijan. Very seldom, Гюндюз is the forename as well as the last name.