Awan (religious figure)

According to the Book of Jubilees, Awan (also Avan or Aven, from Heb. אָוֶן aven - "vice", "iniquity", "potency") was the wife and sister of Cain and the daughter of Adam and Eve. Similarly, her sister Azura (עֲצֻרָה atzurah - "restraint") was the wife of Cain's two brothers - Abel and after Abel's murder, Seth.

...
Wikipedia