Last name Humajun (Хумаюн 
, Humajun 
, ہمایوں) , in the entire world, is a very rare cognomen. The cognomen Humajun is habitual in Armenia, where it is a rare surname, Kyrgyzstan, and Ukraine, where it is an extremely rare surname. In absolute terms, the name is most common in Armenia, Kyrgyzstan, and Russia. More prevalently, Humajun is the forename as well as the last name.