Collected Writings of J.N. Darby: Apologetic 1, Isaac, Of the Name of (17:19)
There are no two reasons for the name of Isaac. God directs his name to be called Isaac-"laughter"-as a term of joy and gladness at this peculiar blessing to Abraham. Sarah takes up the name when he is born, and says, "God hath made me to laugh;" but this is no double account of his name.