Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 6
Sanskrit:
स एव शत्रुजिद् वत्स ऋतध्वज इतीरित: ।तथा कुवलयाश्वेति प्रोक्तोऽलर्कादयस्तत: ॥ ६ ॥
ITRANS:
sa eva śatrujid vatsaṛtadhvaja itīritaḥtathā kuvalayāśvetiprokto ’larkādayas tataḥ
Translation:
Dyumān was also known as Śatrujit, Vatsa, Ṛtadhvaja and Kuvalayāśva. From him were born Alarka and other sons.