In the Book of Mormon, why isn’t the record of Helaman found in the Book of Alma called the Book of Helaman?
The books of the Book of Mormon were written by Mormon, who undoubteldy named the various books, although they each contain the abrdigement from several original authors.
The Egyptian language written by the Nephites was gradually modified over their thousand year history so that the Prophet Moroni, the last author of the Book of Mormon, called it a reformed Egyptian.
No specific dates are given by Nephi in the Book of Mormon as to any occurances, nor is any archealogical site identified with a Book of Mormon site.
The plates from which the Book of Mormon was translated were received by Joseph Smith in September 1827, and returned to the Angel Moroni sometime afte June 11, 1829.