Cainan in Smiths Bible Dictionary

(possessor) 1. Son of Enos, aged 70 years when he begat Mahalaleel his son. He lived 840 years afterwards, and died aged 910. Ge 6:9-14 2. Son of Arphaxad, and father of Sala, according to Lu 3:36,37 and usually called the second Cainan. The is nowhere named in the Hebrew MSS. It seems certain that his name was introduced into the genealogies of the Greek Old Testament in order to bring them into harmony with the genealogy of Christ in St. Luke's Gospel.