Garudapurana 3.5.46

3.5.46

bhṛgormaharṣeḥ putraśca cyavanaḥ samudāhṛtaḥ /
bṛhaspateśca putrastu utathyaḥ parikīrtitaḥ //

and the son of the great sage Bhṛgu is declared as Cyavana;
and the son of Bṛhaspati is proclaimed as Utathya;