God said: Indeed, Sarah your wife shall bear you a son, and you shall call his name Yitzchak; I will establish My covenant with him as an everlasting covenant for his offspring after him.
English of Core Text: It was taught: Yitzchak is one of those for whom a name was called before they were born… Why was the name of Avraham and of Yaakov changed, but not that of Yitzchak? Because their fathers named them, but Yitzchak — the Holy One named him.
On the daf / in context: Divine naming before birth places Yitzchak in a small set (with Yishmael, Yoshiyahu, Shlomo) and explains why his name never needed alteration.
Type of Learning
Custom
What Is Learned
Yitzchak’s name is unique among the patriarchs in being fixed by God before birth and never changed.