Surname नीरज (Niraj 
, Neeraj , नीरज ) , across the world, is a common cognomen. The family name नीरज is habitual in Mauritius, where it is quite a rare surname, Nepal, and Qatar. Measured by absolute frequency, it is commonest in Southern Asia, particularly India, Nepal, and Sri Lanka. Much more prevalently, नीरज is the forename as well as the last name.