West Punjab
At Independence there was a Muslim majority in West Punjab with significant Hindu and Sikh minority. Nearly all of these minorities left West Punjab for India, to be replaced by large numbers of Muslims fleeing from the opposite direction. The official language of West Punjab was Urdu but most of the population spoke Punjabi using the Shahmukhi script. The linguist George Abraham Grierson in his multi volume Linguistic Survey of India (1904–1928) considered the various dialects up to then called "Western Punjabi", spoken in North, West, and South of Lahore in what is now Pakistani Punjab, as constituting instead a distinct language from Punjabi. (The local dialect of Lahore is the Majhi dialect of Punjabi, which has long been the basis of standard literary Punjabi.) Grierson proposed to name this putative language "Lahnda", and he dubbed as "Southern Lahnda" the coherent dialect cluster now known as Saraiki spoken in Multan Dera Ghazi Khan and Bahawalpur division and "North Lahnda" now known as Potwari spoken in Rawalpindi division and "Western Lahnda" now known as Hindko spoken in the regions bordering Khyber-Pakhtunkhwa.
Demographics of Pakistan
Around 80% of Pakistan's population speak one or more of the various Indo-Aryan languages. Usually concentrated in the heavily populated areas east of the Indus river, the Indo-Aryan languages and their cultures form the predominant cultural group in the country. They derive their roots from the Sanskrit language of Aryan invadors and are later heavily influenced by the languages of the later Muslim arrivals (i.e., Turkish, Persian, and Arabic), and are all written in a variant of either the Arabic or Nastaliq script. Urdu, the country's national language, is an Indo-Aryan tongue. Punjabi, Hindko and Seraiki, all mutually intelligible, are classified by linguists as dialects of an Indo-Aryan speech called Lahnda, also spelled as Lehnda. These are also, to a lesser extent, mutually intelligible with Urdu. Added together, speakers of these mutually-intelligible languages make up nearly two-thirds of Pakistan's population. Sindhi is the common language of the people of Sindh in southern Pakistan and has a rich literary history of its own, traced back to the era of the early Arab arrivals. The Dardic languages of Gilgit–Baltistan, Azad Kashmir and the northwestern mountains are sometimes classified by many linguists as belonging to the Indo-Aryan family. Other Indo-Aryan languages include Gujarati, Kutchi, Memoni and others.