Bhagavatapurana 9.17.2

9.17.2

anenā iti rājendra śṛṇu kṣatravṛdho 'nvayam /
kṣatravṛddhasutasyāsan suhotrasyātmajāstrayaḥ //

2. & 3. O great king, hear of the line of Kshatravridha, (the sinless); his son Suhotra had three sons named Kasya, Kusa and Gritsamada and Gritsamada's son was Sunaka, and his son Saunaka, a sage most important of the followers of Rig Veda.