Can we just get one thing straight?
Jehovah is a translation of the divine name in the OT scriptures YHWH - so no the form "Jehovah" specifically doesn't appear in the OT, however it cannot be argued the name does..
People who have an aversion to "Jehovah" should also then have an aversion to every other name in the bible especially Jesus (or the Word) and the holy spirit (since they are God as well) Why is it only the "son" has a name "Jesus" or "The word" yet apparently "Father" is the Fathers name and "holy spirit" is the holy spirits name..
"Since there is no God named "Jehovah", this is a medieval misreading" - there is no person named "Jesus" in early times either, they are both transliterations of the original language manuscripts, you can twist these words anyway you like, however you know exactly what he meant, else you would be citing him all over the place to prove your trinity.. like you have others.
"There is no /dʒ/ sound in Hebrew." - shall I list the names that start with a "Y" and translated as "J" in English? I have gathered an entire table of them... better yet do the "research" yourself its not hard, Ill start and you go and look up the names in NIV, ESV or whichever bible you like:
Jacob
Jehoram
Jerusha
Jehu
Jehoaddan
(try the cited sources here: https://en.wikipedia.org/wiki/List_of_biblical_names_starting_with_J)
you have some points on George Howard, however you'll have trouble with other scholars who agree with him - like it or not his theory cannot be dismissed..
funny how the only name [that is absent] is the one that allows the trinity to thrive.. Shall we also mention that every pre-christian copy of the LXX contains the name not the surrogate..
The rest of the babbel on "I am" and other stuff I will simply say: go and do better research, check the LXX and learn what the past progressive idoim is. (+ what James white and Daniel Wallace have both said on this subject)
""The "Lord's Prayer" is a prayer addressed to our Father. If Jesus really wanted to encourage the use of the Name with the Lord's Prayer, why should we call God Father, why doesn't the prayer start like this: "Our Lord...", or like this: "Our Jehovah"?
- very bad scholarship - what I would consider psuedo-scholarship... How many articles do I need to cite? if "name" meant something other than "name" then it is interesting in the OT such emphasis is placed on the Divine name, also curious that Isaiah refers to the divine name as "Father" a (known) Hebrew idoim in the creation clause (look it up).
sanctifying Gods "being" is pointless, because his "being" is already holy and not smothered - got a lot of questions to actually answer here.
also lets just remember:
(John 8:26, 27)
“. . ., the One who sent me is true, and the very things I heard from him I am speaking in the world.” 27 They did not grasp that he was talking to them about the Father.”
(John 8:54)“. . .It is my Father who glorifies me, the one who you say is your God.”