Bhagavatapurana 4.1.41

4.1.41

citraketuḥ surociś ca virajā mitra eva ca /
ulbaṇo vasubhṛdyāno dyumān śakty-ādayo 'pare //

40-41. O Vanquisher of enemies (Vidura), the sons of Vasishṭha by Ūrja (Arundhati) were Chitraketu and others who became the seven sages of untainted nature; these were called Chitrakētu, Surochis, Virajas, Mitra, Ulbana, Vasubhridyāna and Dyumat; and Vasishṭha had also other sons, Sakti and others, (who were born of another wife).