Pakhtoon designates a person who speaks Pukhtu. Pathan is a Hindi term adopted for them by the British. The racial composition of the Pukhtoons is less than clear. The tribes who dwelled in the area in the days of the Greek historians are believed to be part of the great Aryan horde which had moved down from Central Asia a millennium earlier. Over the course of centuries, the Greek, Persian, Turk, and Mongol invaders who passed through the Frontier have added their blood.Nearly one-third of the population of NWFP is non-Pakhtoon. In the tribal areas, they are called Hamsaya or Kadwal. In the border areas of Hazara and Derajat, social norms more closely resembling those in Punjab and Kashmir may be discerned.