Joshua Jonathan Sir,Rajus are described as Kshatriyas by Government of Andhra Pradesh and also a forward caste.But Kshatriya Rajus in Tamil Nadu due to their economic backwardness asked themselves to be placed in backward class.What i mean to say is the statement given by K.S.Singh about 8 Kshatriya Castes is submitted to the Backward commission.I am saying that the article about 8 castes is deleted in this page not about the Tamil Kshatriya Rajus.Not about its usage i.e statements of book to backward commission.What i mean to say is these 8 communities are of real kshatriya varna .So,this statement of K.S.Singh is submmitted to Backward commission of Central Government. Sir, I am unable to enter the link here.But you can write it in google search as" Kshatriya Raju Backward class" then u will find the link for National Backward class commission at the first.You can download the pdf & see. If u beleive those are reliable u place only the paragraph of 8 communities of K.S.Singh in this Rajus page not the discussion in backward commission. 

 Coming to the gotras,see the following links: http://books.google.co.in/books?ei=UZAMU5WWGIyMrAecmYGICQ&id;=1lZuAAAAMAAJ&dq;=inauthor%3A%22Singh+K+S%22&focus;=searchwithinvolume&q;=chandravamsamu