Somavaṃśa-prasavaḥ
Birth of the Lunar Line: Budha–Purūravas and the Urvaśī Episode
देवैर्दत्तः शुनःशेफो विश्वामित्राय वै पुनः / देवैर्दत्तः स वै यस्माद्देवरातस्ततो ऽभवत्
devairdattaḥ śunaḥśepho viśvāmitrāya vai punaḥ / devairdattaḥ sa vai yasmāddevarātastato 'bhavat
Śunaḥśepha, bestowed by the gods, was again given to Viśvāmitra. Since he was truly a gift of the devas, he therefore came to be called Devarāta.