וַיִּוָּלֵ֣ד לְיוֹסֵף֮ בְּאֶ֣רֶץ מִצְרַיִם֒ אֲשֶׁ֤ר יָֽלְדָה־לּוֹ֙ אָֽסְנַ֔ת בַּת־פּ֥וֹטִי פֶ֖רַע כֹּהֵ֣ן אֹ֑ן אֶת־מְנַשֶּׁ֖ה וְאֶת־אֶפְרָֽיִם׃
And unto Joseph in the land of Egypt were born Manasseh and Ephraim, whom Asenath the daughter of Poti-phera priest of On bore unto him.
Read kabbalistic (mystical) interpretation of Genesis 46:20: and classical mystical sources.