Anushasana Parva 85.104

Bhrigu beget seven sons all whom became equal to him in merits and qualities. Their names are Chyavana, Vajrashirshan, Suchi, Urva, Shukra, that giver of boons, Vibhu and Savana. These are the seven. They are children of Bhrigu and are hence Bhargavas. They are also called Varunas on account of their ancestor Bhrigu having been adopted by Mahadeva in the form of Varuna. You belong to the race of Bhrigu.