Ayati is a brother of king Yayāti (Yayati) belonging to Candravaṁśa (Chandravamsa; the Lunar dynasty), and the son of King Nahuṣa (Nahusha).

Mahābhārata (Kinjawadekar)(1.75.30)
Mahābhārata Vols. 1-43 (Siddhāntabāgīśa)(1.63.33)