There are several theories on her origin; according to an alternative version Omosuhon 'Sogamonogatari,' Torajo's mother was a courtesan in Hiratsuka City named Yashao and her father was Kunai hogan Ienaga who escaped from the capital to Ebina-go, Sagami Province.
虎女の出自については諸説あるが、重須本「曽我物語」では、虎女の母は平塚市の遊女夜叉王で父は都を逃れて相模国海老名郷にいた宮内判官家永だとされている。