On: Capitol of Lower Egypt
Source: Nav
Genesis 41:45
Pharaoh gave Joseph the name Zaphenath-paneah, and he gave him Asenath daughter of Potiphera, priest of On, to be his wife. And Joseph took charge of all the land of Egypt.
Genesis 46:20
Manasseh and Ephraim were born to Joseph in the land of Egypt by Asenath daughter of Potiphera, priest of On.