SB 9.1.41

tasyotkalo gayo rājan
 vimalaś ca trayaḥ sutāḥ
dakṣiṇā-patha-rājāno
 babhūvur dharma-vatsalāḥ
Word for word: 
tasya — of Sudyumna; utkalaḥ — by the name Utkala; gayaḥ — by the name Gaya; rājan — O King Parīkṣit; vimalaḥ ca — and Vimala; trayaḥ — three; sutāḥ — sons; dakṣiṇā-patha — of the southern part of the world; rājānaḥ — kings; babhūvuḥ — they became; dharma-vatsalāḥ — very religious.
Translation: 
O King, Sudyumna had three very pious sons, named Utkala, Gaya and Vimala, who became the kings of the Dakṣiṇā-patha.