The Shahpuri is a dialect of Punjabi

Punjabi language

Punjabi is an Indo-Aryan language spoken by inhabitants of the historical Punjab region . For Sikhs, the Punjabi language stands as the official language in which all ceremonies take place. In Pakistan, Punjabi is the most widely spoken language...

 language, named due to the town of Shahpur, currently in Sargodha district

Sargodha District

Sargodha District is a district of Punjab province, Pakistan, the capital of the district is Sargodha. It is an agricultural district, wheat, rice, and sugarcane being its main crops. The Sargodha district and region are also famous for citrus fruit; kino is a newly developed variety...

. This dialect has been spoken by the people of District Sargodha including Dera Chanpeer Shah, Khushab, Jhang, Mianwali, Attock, parts of Faisalabad (formerly Lyallpur), parts of Dera Ismail Khan, Dera Ghazi Khan, Bahawalnagar, Chakwal, Mianwali, Sargodha, Khushab and Mandi Bahauddin districts.