What is the meaning of name Isaac?
The name Isaac, Yitzchak in Hebrew, is derived from the Hebrew root meaning laughter. He was called Yitzchak, by Divine instruction on account of the laughter that Sarah laughed when she was told of his forthcoming conception and birth. In a different yet related sense, Isaac represents the attribute of Divine justice (din). In the World to Come, reward will be given with the attribute of justice, and the name of Isaac represents the joy of that time.