Surname Naidan (乃丹 
, Naidan 
, Найдан 
) , around the globe, is a rare cognomen. The family name Naidan is habitual in Mongolia, where it is quite a common surname, Hungary, where it is a rare surname, and Ukraine, where it is a very rare surname. Measured by absolute frequency, it is commonest in Mongolia, China, and Ukraine. Also, Naidan is the forename as well as the last name.