Family name Gaidar (Haydar 
, Гайдар 
, Gaidar 
) , around the world, is a common last name. The family name Gaidar is habitual in Western Asia, particularly Lebanon, where it is a common surname, Qatar, where it is quite a common surname, and Syria. Measured by absolute frequency, the name is most common in Lebanon, Bangladesh, and Ukraine. More frequently, Gaidar is the forename as well as the last name.