According to Bhagavata Purana,
These are the names of the Priyavrata. Seven (out of ten sons) who inherited the continents from Priyavrta. The three sons, Mahavira, Savana, and Kavi were avowed inveterate Bramacharins (celibate seekers of Bramah Vidya and god). (Priyavrata married Barhjismati, daughter of Visvakarma, the architect of the gods who gave him ten sons and a daughter Urjasvati.) Priyavrata had, by another spouse, three sons: Uttama, Tamasa, and Raivata who were in charge of three Manvantras, named after them.
I find difficult to understand this - thus, now he question from my side is - what are seven continents?