Charles Ellicott Commentary Genesis 12:14-15

"And it came to pass, that, when Abram was come into Egypt, the Egyptians beheld the woman that she was very fair. And the princes of Pharaoh saw her, and praised her to Pharaoh: and the woman was taken into Pharaoh`s house." — Genesis 12:14-15 (ASV)

Pharaoh is not the name of a person, but was the title held by all the Egyptian monarchs.