That’s a shame, because, far from being forbidden to Christians to use the name, it is very much encouraged:
“For whosoever shall call upon the name of the Lord shall be saved.” Romans 10:13
I suggest — just a suggestion — that since the Annunciation the, so to speak, “operative” Name of the Lord is Jesus, and I would appeal to Philippians 2:5-11 as a guide to pious practice if not to theology.
Jesus.