Surname Namkhai (Namkhai 
, Норбу 
, Намхай ) , worldwide, is a rare last name. The family name Namkhai is habitual in Mongolia, where it is quite a common surname, Russia, where it is a very rare surname, and Hungary. Not in comparison with a country's population, the name is most common in Mongolia, Russia, and China. Likewise, Namkhai is the forename as well as the last name.