“The son of Cainan,
The son of Arphaxad,
The son of Shem,
The son of Noah,
The son of Lamech.”
τοῦ Καϊνὰμ τοῦ Ἀρφαξὰδ τοῦ Σὴμ τοῦ Νῶε τοῦ Λάμεχ
Thus, we have about 10 generations from Noah to Abram, about 400 years if you go by the first born. Once again, this is based on Genesis, chapters 5-10, and 1 Chronicles, chapter 1:3-27. Luke said that Shelah was the son of Cainan (τοῦ Καϊνὰμ), the son of Arphaxad (τοῦ Ἀρφαξὰδ), the son of Shem (τοῦ Σὴμ), the son of Noah (τοῦ Νῶε), the son of Lamech (τοῦ Λάμεχ). Lamech was the father of Noah. Genesis, chapters 6-8, details Noah’s ship building and the famous Noah’s ark. Shem was the oldest of the 3 sons of Noah, the favorite of the biblical authors. The descendants of Shem will become the Semites. Some believe that the word Semite comes from his name Shem. Shem had five sons in Genesis, chapter 10. Shem became the father of Arphaxad or Arpachshad two years after the flood, so that this Arphaxad lineage became the most important. When Arphaxad had lived thirty-five years, he became the father of Shelah. However, in this list in Genesis, there is no mention of Cainan as the son of Arpachshad, except in the Greek Septuagint. Instead, Canaan was the son of Ham, the brother of Shem.