Bithiah daughter of Pharaoh בתיה בת פרעה

In the text of Exodus she is not named: "and the daughter of Pharaoh came down to bathe at the river." She sees the basket among the reeds, sends her maid, opens it — and there is a weeping boy. It is said plainly that she understood: "this is one of the Hebrews' children." And she took him anyway.

Then comes the scene arranged by Miriam, standing at a distance: shall I call a nurse from the Hebrew women? So the infant returns to his own mother, who is paid for nursing her own son.

It was she who named him: "and she called his name Moses, and said: because I drew him out of the water." The only prophet's name in the Tanakh given by a foreign woman — and in her own language it would not have sounded that way; the explanation is in Hebrew.

Her own name tradition takes from the genealogies in Chronicles, where among the descendants of Judah is named "Bithiah, daughter of Pharaoh." The midrash (Leviticus Rabbah 1:3) explains the name with a famous line: Moses was not your son, yet you called him your son; you are not My daughter, yet I call you My daughter — Bat-Yah, daughter of God.

That line is often cited to Megillah 13a, where the identification does appear — but the sentence itself stands in Leviticus Rabbah.