Last name Khaj (Khaj 
, Кхай 
, خاج 
) , worldwide, is a rare family name. The last name Khaj is characteristic of Saudi Arabia, where it is a rare surname, Iran, and Morocco, where it is a very rare surname. In absolute terms, the name is most common in India, Iran, and Saudi Arabia. Likewise, Khaj is the forename as well as the last name.