Somavaṃśa-prasavaḥ
Birth of the Lunar Line: Budha–Purūravas and the Urvaśī Episode
कच्छपः पूरणश्चैव विश्वामित्रसुतास्तु वै / तेषाङ्गोत्राणि बहुधा कौशिकानां महात्मनाम्
kacchapaḥ pūraṇaścaiva viśvāmitrasutāstu vai / teṣāṅgotrāṇi bahudhā kauśikānāṃ mahātmanām
Kacchapa and Pūraṇa too were sons of Viśvāmitra. The gotras of those great-souled Kauśikas spread forth in many branches.