Surname Хейдар (Heydar 
, Hejdar 
, Geidar 
) , in all the world, is quite a rare cognomen. The surname Хейдар is characteristic of Azerbaijan, where it is quite a rare surname, Georgia, and Somalia, where it is a rare surname. Not in comparison with a country's population, it is commonest in Azerbaijan, Iran, and Somalia. More prevalently, Хейдар is the forename as well as the last name.