What is "shirani"

The Shirani —also called Sherani —are a Pashtun tribe, from the Bettani tribal confederacy, who live in Pakistan, Afghanistan, and India. The Sherani are mostly settled in the Frontier Region Dera Ismail Khan, in the Federally Administered Tribal Areas of Pakistan and in the adjoining Sherani District of Balochistan, Pakistan. Some clans have settled in other surrounding districts of Balochistan; and in the Zabul, Ghazni, and Kandahar provinces of Afghanistan.