Markandeyapurana 53.28

53.28

tathaiva śālmalesteṣāṃ samanāmāni sapta vai /
sapta medhātitheḥ putrāḥ plakṣadvīpeśvarasya vai //

And Vapuṣmat the lord of Śālmali had seven sons, both Śveta, and Harita, Jīmūta, and Rohita, Vaidyuta, and Mānasa, and Ketumat the seventh. And they had seven countries in Śālmali, which bore the same names.

Medhātithi, the lord of Plakṣadvīpa had seven sons, and Plakṣadvīpa was divided into seven parts by the countries which were named after them, first the Śākabhava country, then Śiśira, Sukhodaya, and Ānanda, and Śiva, and Kṣemaka, and Dhruva.