God's Name is in the OT over 6,500 times- as you should know. To pretend it doesn't exist, ot that it isn't his name anymore since it is not in the NT is ignorant.
Exodus 3:15- And God said moreover unto Moses, Thus shalt thou say unto the children of Israel,
Jehovah,
the God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob, hath sent me unto you:
this is my name
forever,
and this is my memorial unto all generations.