The name comes from a time in the Bible when Moses had the courage to ask God for his name and God replied YHWH, prononced YaH-WeH, we've added the "a" and the "e" as the English language prefers vowels but the original spelling When pronounced without vowels, if sounds like breathing.YH (inhale): WH (exhale). This is why YHWH was considered an unspeakable name... because it is not supposed to be spoken, but breathed.