Jatts are in most probability, Indo-Scythian with some Greek and Kushan touches. Gujjars claim descent from Kushans. But that's to be contested. Gujjar name bears more similarity to Swetha Huna who had Turkic touches though the base population was Iranian and Tocharian. Kushans in my opinion are ancestors of Khatris,Rajputs and Pashtuns. Well,in part and not whole.