I am not sure but I have heard from old folks from Deoli village that most of the jats particularly in South Delhi villages whose forefathers were the Soldiers of Prithviraj Chauhan and the land for agriculture was given by the king for their bravery. Originally they belong to Rajasthan and there ancestoral links can be found there. Sejwal Jats are found In Lado-Sarai and Adhchinni villages in Delhi. Anyone can elaborate it further.