According to Joseph McConkie, the name "Jehovah" (Moroni 10:34) is the English rendering of the Hebrew tetragram YHWH. It is derived from the verb "to be," which implies his eternal nature. I AM is the first person singular form of the verb "to be." In the name Jehovah, or I AM, God manifests himself as a personal living being who labors in behalf of Israel and who will fulfill the promises made to the fathers. . . . Thus, to declare the name of the Lord was to testify of the Lord, a concept lost to both Jews and Christians alike by false traditions and faulty Bible translations. "For this cause," the Lord told Moses, "have I raised thee up, for to shew in thee my power; and that my name may be declared throughout all the earth" (Exodus 9:16). [Joseph F. McConkie, Gospel Symbolism, p. 177]
“To Meet You Before the Pleasing Bar”
Moroni concluded the plates of Mormon, looking forward to the time when all people will meet him "before the pleasing bar of the great Jehovah, the eternal judge of both the quick and dead" (Moroni 10:34). According to John Welch, this is the only text in which a Book of Mormon prophet used the name "Jehovah." Assuming that the word "Jehovah" in Moroni 10:34 is a literal translation of the ancient Hebrew tetragrammaton (the protected holy name of God), it appears that Moroni finally felt safe in writing this name as a concluding seal, knowing that no one else in his lifetime would see the record and, reading it, would ever misuse that sacred name. [John W. Welch, "Ten Testimonies of Jesus Christ from the Book of Mormon," F.A.R.M.S., 1994, p. 19]
Note* Moroni might have also used the literal holy name of God as a final witness of the truth of the Book of Mormon--a fact that every person will have to deal with as they face the Lord at the judgment bar. [Alan C. Miner, Personal Notes]
“Jehovah”
Richard Grant notes that according to the current scholarly view, the Old Testament in its present form is considered to be drawn from the work of four major strands or traditions of Hebrew narration, each with its own agenda. These are identified as the Jehovist, the Elohist, the Deuteronomists, and the Priestly writers, usually referred to by the shorthand, J, E, D, and P. Briefly, these traditions each represent a different view of Hebrew history, each written to achieve a specific objective of the author or authors. For example, the Jehovist referred to God as Jehovah while the Elohist: referred to God as Elohim. As has been noted previously in the commentary on 1 Nephi 3:3, the brass plates (and thus all subsequent Nephite scripture) are thought to have been primarily influenced by the E tradition.
With this in mind, and according to John Sorenson, it is interesting that the name "Jehovah" (Yahweh), the preferred J title of deity, occurs only twice in the Book of Mormon (once a quote from Isaiah 12--with one word changed--and again in the very last sentence in the volume--Moroni 10:34). The name "Lord" is usually used for divinity in the Book of Mormon (almost 1400 times). [Richard G. Grant, "The Brass Plates and Their Prophets," [http://www.cometozarahemla.org/brassplates/brass-plates.html;] see also John L. Sorenson, "The Brass Plates and Biblical Scholarship," in Nephite Culture and Society, pp. 26-39] [See the commentary on 1 Nephi 3:3]