|Easton's Bible Dictionary|
(1.) The fourth antediluvian patriarch, the eldest son of Enos. He was 70 years old at the birth of his eldest son Mahalaleel, after which he lived 840 years (Genesis 5:9-14), and was 910 years old when he died. He is also called Kenan (1 Chronicles 1:2).
(2.) The son of Arphaxad (Luke 3:36). He is nowhere named in the Old Testament. He is usually called the "second Cainan."
Int. Standard Bible Encyclopedia
ka'-nan, ka-i'-nan (Kainan):
(1) Greek form of Kenan (Luke 3:37): also the King James Version form in Old Testament (except 1 Chronicles 1:2).
(2) A son of Arphaxad (Luke 3:36), omitted in Genesis 10:24; Genesis 11:12.
Cainan (8 Occurrences)
Luke 3:36 the son of Cainan, the son of Arphaxad, the son of Shem, the son of Noah, the son of Lamech, (WEB KJV WEY ASV BBE DBY WBS YLT NAS NIV)
Luke 3:37 the son of Methuselah, the son of Enoch, the son of Jared, the son of Mahalaleel, the son of Cainan, (WEB KJV ASV BBE DBY WBS NAS)
Luke 3:38 the 'son' of Cainan, the 'son' of Enos, the 'son' of Seth, the 'son' of Adam, the 'son' of God. (YLT)
Genesis 5:9 And Enos lived ninety years, and begat Cainan: (KJV DBY WBS YLT)
Genesis 5:10 And Enos lived after he begat Cainan eight hundred and fifteen years, and begat sons and daughters: (KJV DBY WBS YLT)
Genesis 5:12 And Cainan lived seventy years and begat Mahalaleel: (KJV DBY WBS YLT)
Genesis 5:13 And Cainan lived after he begat Mahalaleel eight hundred and forty years, and begat sons and daughters: (KJV DBY WBS YLT)
1 Chronicles 1:2 Cainan, Mahalaleel, Jared, (DBY)