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
Sindhi is a provincial language spoken as a first language by 15% of Pakistanis, mostly in Sindh. It has a rich literature and is used in schools. It is an Indo-Aryan (Indo-European) language, derived from Sanskrit. The Arabs ruled Sindh for more than 150 years after Muhammad bin Qasim conquered it in 712 AD, remaining there for three years to set up Arab rule. Consequently, the social fabric of Sindh contains elements of Arabic society. Sindhi is spoken by over 36 million people in Pakistan, and is the official language of Sindh province. It is widely spoken in the Lasbela District of Balochistan (where the Lasi tribe speaks a dialect of Sindhi), many areas of the Naseerabad and Jafarabad districts of Balochistan, and by the Sindhi diaspora abroad. Sindhi language has six major dialects: Sireli, Vicholi, Lari, Thari, Lasi and Kachhi. It is written in the Arabic script with several additional letters to accommodate special sounds. The largest Sindhi-speaking cities are Karachi, Hyderabad, Sukkur, Shikarpur, Dadu, Jacobabad, Larkana, Mirpur Khas, Thatta, Badin and Nawabshah. Sindhi literature is also spiritual in nature. Shah Abdul Latif Bhita'i (1689–1752) is one of its greatest poets, and wrote Sassi Punnun and Umar Marvi, folk stories, in his famous book "Shah Jo Risalo".