Bhagavatapurana 5.2.21

5.2.21

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āgnīdhra-sutās te mātur anugrahād autpattikenaiva saṃhanana-balopetāḥ pitrā vibhaktā ātma-tulya-nāmāni yathā-bhāgaṃ jambūdvīpa-varṣāṇi bubhujuḥ //

21. Those sons of Agnīdhra were, through the grace of their mother, from the very moment of birth, possessed of an adamantine frame and strength, and being given their due shares, protected severally their continents, which were so called after them.