Genesis 21:3
And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac.
And Abraham called the name of his son that was borne unto him, whom Sarah bare to him, Isaac. Which is the name he was directed to give him, Genesis 17:19; and he remembers the order, and is obedient to it; the reason of which name, which signifies laughter, was on account of his laughing for joy at the promise made him, as well as there might be afterwards a further reason for it, from Sarah's laughing through distrust; and it might presignify the joy and laughter that would be expressed by others at his birth; and perhaps also that he would be the object of the laughter and derision of his brother; such a number of events agreeing with his name.