Anthropology And Oral Traditions

Some anthropologists lend credence to the oral traditions of the Pashtun tribes themselves. For example, according to the Encyclopaedia of Islam, the theory of Pashtun descent from Israelites is traced to Maghzan-e-Afghani who compiled a history for Khan-e-Jehan Lodhi in the reign of Mughal Emperor Jehangir in the 17th century.
Another book that corresponds with Pashtun historical records, Taaqati-Nasiri, states that in the 7th century BC a people called the Bani Israel settled in the Ghor region of Afghanistan and migrated later to the southeast areas. These references to Bani Israel agree with the commonly held view by Pashtuns that when the twelve tribes of Israel were dispersed (see Israel and Judah and Ten Lost Tribes), the tribe of Joseph, among other Hebrew tribes, settled in the region. This oral tradition is widespread among the Pashtuns. There have been many legends over the centuries of descent from the Ten Lost Tribes after groups converted to Christianity and Islam. Hence the tribal name Yusufzai in Pashto translates to the "son of Joseph". A similar story is told by the 16th century Persian historian, Ferishta.

Caucasian race includes Pashtun (Afghan), seen on the right bottom row.

One conflicting issue in the belief that the Pashtuns descend from the Israelites is that the Ten Lost Tribes were exiled by the ruler of Assyria, while Maghzan-e-Afghani says they were permitted by the ruler to go east to Afghanistan. This inconsistency can be explained by the fact that Persia acquired the lands of the ancient Assyrian Empire when it conquered the Empire of the Medes and Chaldean Babylonia, which had conquered Assyria decades earlier. But no ancient author mentions such a transfer of Israelites further east, or no ancient extra-Biblical texts refer to the Ten Lost Tribes at all.
Other Pashtun tribes claim descent from Arabs, including some even claiming to be descendants of the Islamic prophet Muhammad (referred to as Sayyids). Some groups from Peshawar and Kandahar claim to be descended from Ancient Greeks that arrived with Alexander the Great.
In terms of race, the Pashtuns are classified as Caucasians of the Mediterranean variant. Their Pashto language is classified under the Eastern Iranian sub-branch of the Iranian branch of the Indo-European family of languages.
Early precursors to the Pashtuns were old Iranian tribes that spread throughout the eastern Iranian plateau. According to the Russian scholar Yu. V. Gankovsky, the Pashtuns probably began as a "union of largely East-Iranian tribes which became the initial ethnic stratum of the Pashtun ethnogenesis, dates from the middle of the first millennium CE and is connected with the dissolution of the Epthalite (White Huns) confederacy." He proposes Kushan-o-Ephthalite origin for Pashtuns.
Those who speak a dialect of Pashto in the Kandahar region refer to themselves as Pashtuns, while those who speak a Peshawari dialect call themselves Pukhtuns. These native people compose the core of ethnic Pashtuns who are found in southeastern Afghanistan and western Pakistan. The Pashtuns have oral and written accounts of their family tree. The elders transfer the knowledge to the younger generation. Lineage is considered very important and is a vital consideration in marital business.