the use of any proper name for the one and only God, as though there were other gods from whom He had to be distinguished, was discontinued in Judaism before the Christian era and is entirely inappropriate for the universal faith of the Christian Church.
That's basically why Paul never described the God he was trying to distinguish from all the others as YHWH at the Aeropagus, in Acts 17. It would've meant nothing to all those non-Hebrew speakers and so would've been entirely inappropriate. God was the universal father of all and referring to him by his old covenant Hebrew title was no longer appropriate.