Matsyapurana 12.15

12.15

evaṃ purūravāḥ puṃsor abhavad vaṃśavardhanaḥ
ikṣvākur arkavaṃśasya tathaivoktastapodhanāḥ //

That region where this happened, came to be known as Ilâvṛitavarṣa (Mongolia ?), and Ila in that way appeared at the inception of the Solar and the Lunar races, in other words, Purûravâ, the son of Budha, from Ilâ, was the founder of the lunar race, and Ikṣvâku of the solar clan.—14-15.