This is the link....http://en.wikipedia.org/wiki/Dahiya
I have pasted the important things here....
Dahiya is a gotra of jats found in Rajasthan, Haryana and Uttar Pradesh in India.Some Dahiya Jats who lived in Rajasthan mixed up with the Rajputs and was therefore called Rajputs.(so..it might be possible that Harssh is not a descendant of PRC) Dahiyas are descendants of one of the four son of Prithviraj Chauhan.The writer of these lines, Rahul Dahiya, has met the bhaats and has seen their records personally. He saw , names , right from his name backtracking to Prithviraj Chauhan's name in the bhaat records. Incidentally , the bhaats' records are considered very reliable and trusted even to solve disputes related to wealth inheritance.
The 'bhaats' have carried this tradition for ages and keep on updating their records every year by visiting their patrons' homes. The bhaats further tell that Dahiyas are based in 50 villages in Haryana and another 50 in Uttar Pradesh. They arrived from Rajasthan to Haryana in/around the 12th century A.D. and thereafter scattered around in different villages in the vicinity. (Above statements can be verified by meeting the 'bhaats' in Haryana.)
Rajat's place of birth is Haryana.....so....it might be possible that Rajat might be a descendant of Prithviraj Chauhan.....if people conduct DNA tests on Rajat with the help of the real descendant of PRC.....they might be some sensible conclusion to my sentence!! Okay....I am overdoing it....But I thought some "investigation" in this issue might spice up the discussion in our forum!!😊