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Ghumans are descended from Raja Sanpal, who was a Rajput Janjua Prince. Raja Sanpal Janjua, was the younger son of Raja Jodh[1], the conqueror of Makhiala. Raja Jodh Janjua was the son of Raja Mal Khan Janjua, the ruler of Malot Fort in Chakwal, originally hailing from Raja Dalip Singh of Delhi. Raja Sanpal Janjua married many wives and had many sons, who founded various sub tribes and clans. Raja Sanpal's youngest son, Raja Ghumman Janjua, took service in Jammu during the rule of Sultan Firuz Shah of Delhi, founded Ghumman tribe.
Ghummans are the most prominent caste of Punjab and they claim to be the owners and lords of Punjab and claim to be from the Royal family. They intermarry with all the leading Rajputs and JATS, with the exception of the Mans. They have a few peculiar wedding customs, such as the worship of an idol made of grass tied up with red cloth, and the pouring of water on a lambs head. They are good agriculturists.
Ghumman's tribe eventually primarily settled in Sialkot and remained as Jagirdars and a powerful tribe in the area. .Village Punj Graheen is a famous Ghumman town in Pakistan. In Sialkot, they live in village Muhadipur and many other villages and Sambrial is known to be their main area. As they were the Jagirdars of Punjab, so when Sambrial's land was not enough for them, they moved to their Chiragahs like ghuainkiii (Ghuman ke) Dugri Ghuman, Paki kotli (Kotli Sura Singh Ghuman) etc.
Village Punj Graheen is a famous Ghumman town in Pakistan. In Sialkot, they live in village Raja Ghumman tehsil Daska, village Muhadipur in Sailkot and many other villages and Sambrial is known to be their main area. As they were the Jagirdars of Punjab, so when Sambrial's land was not enough for them, they moved to their Chiragahs like Ghuainkiii (Ghuman ke) Dugri Ghuman, Paki kotli (Kotli Sura Singh Ghuman) etc. After 1947, most of the Ghuman jat sikh migrated from Sialkot & other parts of Pakistan to various part of India like Gurdaspur, Jalandhar, etc
Ghummans also settled in the Gurdaspur, Jalandhar, Kapoorthala and Sangrur districts of Punjab in India. The Ghuman village in Gurdaspur is mentioned in the Sikh history.There is gurduwara sahib named Chotte Ghumani in Gurdaspur. Ghumans also settled in village Shien Bhati & Pheni bhanger in Gurdaspur.
Under the British Raj of India, they were designated as a Martial Race and provided strong numbers to the British Imperial Army and fought in both World Wars. The Ghummans are hardworking and excellent cultivators, generally tilling their own land, and working laboriously on their own wells. Ghummans are very proud of their ancestry, make good soldiers...they are usually addressed as "Raja & Chaudhary", and stand very high in social rank.
Today they occupy major positions within the Punjab government and are a still a powerful tribe of respected position.

http://en.wikipedia.org/wiki/Ghuman