According to Brahmāṇdapurāṇa (Brahmandapurana), Āyuṣmān (Ayushman) is one of the sons of King Uttanapāda (Uttanapada), born of the womb of Sunṛtā(Sunrita).

Brahmāṇḍapurāṇa (Maharṣi)(1.36.89)