Of the one hundred sons of Lord Ṛṣabhadeva, the eldest, Bharata, was completely devoted to Lord Nārāyaṇa. It is because of Bharata’s fame that this planet is now celebrated as the great Bhārata-varṣa.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तेषां वै भरतो ज्येष्ठो नारायणपरायणः । विख्यातं वर्षमेतद्यन्नाम्ना भारतमद्भुतम्
teṣāṃ vai bharato jyeṣṭho nārāyaṇaparāyaṇaḥ | vikhyātaṃ varṣametadyannāmnā bhāratamadbhutam
SB 11.2.17