Surname Долгаиа (Долгаиа 
, Dolgaia 
, Dolgaya 
) , globally, is a rare family name. The family name Долгаиа is habitual in Eastern Europe, particularly Belarus, where it is a rare surname, Russia, where it is a very rare surname, and Ukraine, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Russia, Belarus, and the United States.