The answer is real simple. Jehovah of the OT was Jesus Christ, but on earth as a human, his name was Jesus, which explains, obviously, why the name "Jehovah" is only present in the OT.
I don't have time to go into too much detail, you can research this stuff for yourself, but that's why the Bible seems to contradict itself. Jesus is NOT the Almighty, but he IS Jehovah, but Jehovah IS NOT God Almighty. It's really that simple, yet for centuries man has been scratching their heads furiously over this..... Rev ---------- LambsRoar.org