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Those who have no interest in being a Hindu and a follower of Dharmaśāstras should stop calling themselves Kṣatriya, Rājaputra or Rajpūt at all, because the concept of Varna and jāti originates from the Vedas and Śāstras, without following them you cannot be a rajput.
Dr. Rhy David Gives ample evidence to put Panchatantra between 200 BCE - 100 BCE, however some scholars due to difference in manuscript regard it to a much later date. In either case let's see how Brāhmaṇ Viṣṇuśarman mentions Rajputs.