Cognomen Nadâ (Надя 
, Nadâ) , all over the world, is quite a rare family name. The cognomen Nadâ is habitual in Eastern Europe, particularly Moldova, where it is quite a common surname, Bulgaria, where it is quite a rare surname, and Belarus. In absolute terms, this name is the most popular in Eastern Europe, particularly Russia, Bulgaria, and Belarus. More prevalently, Nadâ is the forename as well as the last name.