Abraham had three sons, not two.
Abraham had three sons, Ishmael (literally God will hear), Yitzhak (literally he will laugh) and Yivke (literally he will cry).
Nobody ever heard about Yivke, because he was the small one
The beloved son who was sacrificed on Mount Moriah.
Ishmael was saved by his mother Hagar, Yitzhak was rescued by the angel,
But nobody saved Yivke. When he was small
His father lovingly named him Yivke, Yivk, my lovely little Yevk.
But he sacrificed him at the Akeda.
The Torah says it was a ram, but it was Yivke.
Yishmael never again heard God.
Yitzhak never laughed again
And Sarah only laughed once, never again.
Abraham had three sons,
Yishma, Yitzhak, Yivke,
Ishmael, Yitzhak-el, Yivke-El.
Taken from “Open Shut Open” by Yehuda Amichai: