וַתֵּ֧לֶד הָגָ֛ר לְאַבְרָ֖ם בֵּ֑ן וַיִּקְרָ֨א אַבְרָ֧ם שֶׁם־בְּנ֛וֹ אֲשֶׁר־יָלְדָ֥ה הָגָ֖ר יִשְׁמָעֵֽאל׃
And Hagar bore Abram a son; and Abram called the name of his son,
Read kabbalistic (mystical) interpretation of Genesis 16:15: and classical mystical sources.