Genesis is the first book of the pentateuch. The title comes from the Greek word geneseos, which means origin or source. The expressions appear in various places in the book: these are the origins of Genesis. 2: 4, this is the book of genealogies Genesis: 4: 1, these are the generations of and these are the descendants of, these are the lineages of, this is the story of the family of. For this reason the septuagint applied the name of Genesis, because that is how the book begins.