aapki baat ka jawab jatland pe hi "yauddheya" shabd se related books mein pada hai, for example read this one: http://www.jatland.com/home/Haryana_Ke_Vir_Youdheya
Though main isse fully agree nahin hoon, but fir bhi aapke kaam ka bahut kuchh mil sakta hai aapko is book mein. wo depend karta hai ki aap ismen se kya, kitna aur kyon nikaalna chahenge!
Read another link on JL itself: http://www.jatland.com/home/Yaudheya
http://www.jatland.com/home/Yaudheya...eyas_were_Jats
Though I don't agree with them as they relate it to mythology, except tht part, I am in agreement with them.