Definitions of Isaac:

noun: (Old Testament) the second patriarch; son of Abraham and Sarah who was offered by Abraham as a sacrifice to God; father of Jacob and Esau
name: A male given name (common: 1 in 1960 males; popularity rank in the U.S.: #277)
name: A surname (common: 1 in 14285 families; popularity rank in the U.S.: #1941)