Last name Nitchai (Nitchai 
, นิตชัย , Ничай 
) , in the world, is a rare cognomen. The cognomen Nitchai is characteristic of Ukraine, where it is quite a rare surname, Belarus, where it is a rare surname, and Kazakhstan. Measured by absolute frequency, it is the most numerous in Ukraine, Russia, and Kazakhstan. Very seldom, Nitchai is the forename as well as the last name.