Ugra was the youngest one amongst the sons of Maharṣi (Maharshi; Great Sage) Kavi. In Mahābhārata (Mahabharata), he is mentioned as a Prajāpati (Prajapati; Lord of the people).

Mahābhārata (Kinjawadekar)(13.85.133)
Mahābhārata Vols. 1-43 (Siddhāntabāgīśa)(13.74.131)