וַיִּקְרָ֨א אַבְרָהָ֜ם אֶֽת־שֶׁם־בְּנ֧וֹ הַנּֽוֹלַד־ל֛וֹ אֲשֶׁר־יָלְדָה־לּ֥וֹ שָׂרָ֖ה יִצְחָֽק׃
And Abraham called the name of his son that was born unto him, whom Sarah bore to him, Isaac.
Targum Jonathan on Genesis
And Abraham called the name of his son whom Sarah had borne him Izhak.