Pashtuns (, , ; , ), also known as Pakhtuns or Pathans, are an Eastern Iranian ethnic group historically native to the Pashtunistan region of southern Afghanistan and northwestern Pakistan. They historically were also referred to as Afghans until the 1970s, after the term's meaning had become a demonym for members of all ethnic groups in Afghanistan. The group's native language is Pashto, an Iranian language in the Indo-Iranian branch of the Indo-European language family. Additionally, Dari serves as the second language of Pashtuns in Afghanistan, while those in the Indian subcontinent speak Urdu and Hindi as their second language. Pashtuns are the 26th-largest ethnic group in the world, and the largest segmentary lineage society; there are an estimated 350–400 Pashtun tribes and clans with a variety of origin theories. The total population of the Pashtun people worldwide is estimated to be around 49 million, although this figure is disputed due to the lack of an official census in Afghanistan since 1979. They are the largest ethnic group in Afghanistan and the second-largest ethnic group in Pakistan, constituting around 42 percent of the total Afghan population and around 18.24 percent of the total Pakistani population. In India, significant and historical communities of the Pashtun diaspora exist in the northern region of Rohilkhand as well as in major Indian cities such as Delhi and Mumbai. A more recent Pashtun diaspora has formed in the Arab states of the Persian Gulf (primarily in the United Arab Emirates) as part of the larger Afghan and Pakistani diaspora in that region. Geographic distribution Afghanistan and Pakistan Pashtuns are found all over Afghanistan and Pakistan, especially between south of the Hindu Kush, the Indus River or around the Sulaiman Mountains. Big cities with a Pashtuns-majority include Jalalabad, Kandahar, Khost, Kohat, Lashkar Gah, Mardan, Mingora, Peshawar, Quetta, among others. Pashtuns also live in Abbottabad, Farah, Ghazni, Herat, Islamabad, Kabul, Karachi, Kunduz, Lahore, Mazar-i-Sharif, Multan, Rawalpindi, and several other cities. The city of Karachi in Pakistan is home to the largest community of Pashtuns. India Pashtuns in India are often commonly referred to as Pathans (the Hindustani word for Pashtun) both by themselves and other ethnic groups of the subcontinent. Some Indians claim descent from Pashtun soldiers who settled in India by marrying local women during the Muslim conquest in the Indian subcontinent. Many Pathans chose to live in the Republic of India after the partition of