The daughter of Pharaoh— Pharaoh, in this place, is not the name of an Egyptian king, but of some Israelite called by that name.
Related Commentaries of 1 Chronicles 4:18
1 Chronicles 4:18
18 And his wife Jehudijahh bare Jered the father of Gedor, and Heber the father of Socho, and Jekuthiel the father of Zanoah. And these are the sons of Bithiah the daughter of Pharaoh, which Mered took.