Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 8
Sanskrit:
मरुत्वांश्च जयन्तश्च मरुत्वत्या बभूवतु: ।जयन्तो वासुदेवांश उपेन्द्र इति यं विदु: ॥ ८ ॥
ITRANS:
marutvāṁś ca jayantaś camarutvatyā babhūvatuḥjayanto vāsudevāṁśaupendra iti yaṁ viduḥ
Translation:
The two sons who took birth from the womb of Marutvatī were Marutvān and Jayanta. Jayanta, who is an expansion of Lord Vāsudeva, is known as Upendra.