The name of the God that is the God of Abraham, Isaac, and Jacob is Jesus Christ. In the days of the Jews before He was born as Jesus Christ, He was known as Jehovah or I am that I am. It does not say Jesus Christ name in Nephi 6 or Nephi 19. The Title page names Him as Jesus Christ. In Nephi 6 it only states that it is Him because He is the God Abraham, Isaac, and Jacob and that if men come unto him they will be saved. We can only be saved by Jesus Christ’s grace. In Nephi 19:10 it tells of the things in which Jesus Christ will do when He comes onto the earth and what will happen as the sing of His death. Again, this is how we know it is Him (Jesus Christ). Why is the name of the God of Abraham, Isaac, and Jacob so important to Nephi some would ask? It is because of this, Nephi knew that He (Jesus Christ) wanted him (Nephi) to be writing down the things of Him (Jesus Christ) for all to know of Him (Jesus Christ). This is why Nephi did what was asked of him.
Nephi states that he is writing on the plates to make it clear to all man that he desires the things of God to be written upon the plates and for the things of the world are not to be upon the plates. Nephi also gives a commandment that his seed shall also do the same. In the Title page of the Book of Mormon, it states that the book is the work of Jesus Christ and that all men will know Him by the convincing of the Jew and the Gentile, that He is the Christ. Nephi states that he is of the House of Joseph which is of the House of Israel. The Book of Mormon is for the whole House of Israel, that they who read it will know that the Lord Jesus Christ has made it known the covenants He has made with their fathers are coming back to the earth and that the Lord has not forgotten them and that they are not cast out of His presence.