Brant A. Gardner discusses the name "Ezias" in Helaman 8:20; notes it may be based on New Testament Esaias.
Brant A. Gardner, Second Witness: Analytical and Contextual Commentary on the Book of Mormon, 6 vols. (Salt Lake City: Greg Kofford Books, 2007), 5:133-34
Zenock, a brass plate prophet, does not appear in our received Old Testament, nor does Ezias. This is the only mention of this name in the scriptures. Since Ezias is coupled with Zenock, it is also possible that this is a name from the brass plates for which we have only one reference. The name is suspicious, however. It appears most similar to Esaias as seen in the New Testament (Matt. 3:3, 4:14, 8:17, and others). The New Testament Esaias is the Greek transliteration of the prophet we know as Isaiah from the Old Testament. The presence of the final /s/ on the name comes form the requirement of the Greek language that a male name end in /s/. The final /s/ on Ezias is therefore also suspicious. The intended name from the plates of Nephi is now knowable.