“There is no other deity which affords such a variety of etymologies as Iaho, nor a name which can be so variously pronounced. It is only by associating it with the Masoretic points that the later Rabbins succeeded in making Jehovah read, “Adonai” – or Lord. Philo Byblus spells it in Greek letters ΙΕΥΟ – IEVO. Theodoret says that the Samaritans pronounced it Iabè (Yahva) and the Jews Yaho; which would make it as we have shown I-ah-O. Diodorus states that “among the Jews they relate that Moses called the God Iao.” It is on the authority of the Bible itself, therefore, that we maintain that before his initiation by Jethro, his father-in-law, Moses had never known the word Iaho. The future Deity of the sons of Israel calls out from the burning bush and gives His name as “I am that I am”, and specifies carefully that He is the “Lord God of the Hebrews”, (Exodus 3:18), not of the other nations.
Judging him by his own acts, throughout the Jewish records, we doubt whether Christ himself, had he appeared in the days of the Exodus, would have been welcomed by the irascible Sinaitic Deity. However, “The Lord God”, who becomes, on His own confession, Jehovah only in the 6th chapter of Exodus, (verse 3), finds his veracity put to a startling test in Genesis 22:14, in which revealed passage Abraham builds an altar to Jehovah-jireh.
It would seem, therefore, but natural to make a difference between the mystery-God Ιαω, adopted from the highest antiquity by all who participated in the esoteric knowledge of the priests, and his phonetic counterparts, whom we find treated with so little reverence by the Ophites and other Gnostics. Once having burdened themselves like the Azazel of the wilderness with the sins and the iniquities of the Jewish nation, it now appears hard for the Christians to have to confess that those whom they thought fit to consider the “chosen people” of God – their sole predecessors in monotheism – were, till a very late period, as idolatrous and polytheistic as their neighbors.
The shrewd Talmudists have escaped the accusation for long centuries by screening themselves behind the Masoretic invention. But, as in everything else, truth was at last brought to light. We know now that Ihoh must be read Iahoh and Iah, not Jehovah. Iah of the Hebrews is plainly the Iacchos, (Bacchus), of the Mysteries; the God “from whom the liberation of souls was expected – Dionysus, Iacchos, Iahoh, Iah.”
Aristotle then was right when he said: Joh was Orasmasdes and Ahriman Pluto, for the God of Heaven, Ahura-mazda, rides on a chariot which the Horse of the Sun follows.” And Dunlap quotes Psalm 68:4, which reads: “Praise him by his name Iach, who rides upon the heavens, as on a horse”, and then shows that “the Arabs represented Iauk (Iach) by a horse. The Horse of the Sun, (Dionysus).” Iah is a softening of Iach, “he explains.” Ch and h interchange; so s softens to h. The Hebrews express the idea of LIFE both by a ch and an h; as chiach, to be, hiah, to be; Iach, God of LIFE, Iah, “I am”.
Well then, may we repeat these lines of Ausonius: “Ogugiâ calls me Bacchus; Egypt thinks me Osiris; the Musians name me Ph’anax; the Indi consider me Dionysus; the Roman Mysteries call me Liber; the Arabian race, Adonis!” And the chosen people, Adoni and Jehovah – we may add.”
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 