Matsyapurana 12.14

12.14

ilasya nāmnā tadvarṣam ilāvṛtam abhūttadā
somārkavaṃśayor ādāv ilo 'bhūnmanunandanaḥ //

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.