Genesis 21:3 in the World English Bible
Abraham called his son who was born to him, whom Sarah bore to him, Isaac.
Context
2 For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.
3 And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac.
4 And Abraham circumcised his son Isaac being eight days old, as God had commanded him.