Family name Нихай (Nihaj 
, Nihai 
, Nikhai 
) , in the world, is a rare cognomen. The cognomen Нихай is habitual in Sri Lanka, where it is a rare surname, Romania, and Greece. Not in comparison with a country's population, this name is the most popular in Sri Lanka, Romania, and India. More frequently, Нихай is the forename as well as the last name.