Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 41
Sanskrit:
तस्योत्कलो गयो राजन् विमलश्च त्रय: सुता: ।दक्षिणापथराजानो बभूवुर्धर्मवत्सला: ॥ ४१ ॥
ITRANS:
tasyotkalo gayo rājanvimalaś ca trayaḥ sutāḥdakṣiṇā-patha-rājānobabhūvur dharma-vatsalāḥ
Translation:
O King, Sudyumna had three very pious sons, named Utkala, Gaya and Vimala, who became the kings of the Dakṣiṇā-patha.