Aśva (Aswa) was one of the Rākṣasa(s)(Rakshasa; monster) born of the womb of Khaśā (Khasa), and sired by Kaśyapa (Kasyapa) Prajāpati (Prajapati; Ruler of the people).

Brahmāṇḍapurāṇa (Maharṣi)(1.36.35)