There are generally two approaches to Book of Mormon names. One of them searches for plausible etymologies for Book of Mormon names; the other looks at whether the name is actually attested. If it is attested it does not matter much whether or not we can figure out an etymology for the name (that is, whether we can determine what the name originally meant). Both of these approaches are useful and have their merits.
The Book of Mormon name Gidgiddoni can now be added to the list of names that are attested.