I don't know..ask the Apostle Paul and the other writers of the New Testament why they used Greek equivalents such as Theos and Iesous for the names of God and Jesus Christ.
The language God chose to inspire the New Testament, which is the greater revelation, was Greek, despite claims of some who say it was first written in Hebrew. I know God understands the reverence that we hold Him in, despite what language we say His name.
However, this is not a salvation issue so if someone feels convicted by the need to use Hebrew names, it is fine as long as they don't make it an issue of division. Some of my friends use Hebrew names. God knows their hearts whether they are using it to elevate themselves or their knowledge, or to claim that others are inferior to them in terms of loyalty. If they are, he will deal with them one way or another.
If they are divisive or condemning of other Christians, they would likely find some other criteria for salvation that others don't meet even if they are proven wrong on this. It's part of human nature to create divisions that way to elevate one's self as better than other brothers in Christ.
The mark of a Christian is love for one another and the fact that their faith is solely in Jesus Christ and the sufficiency of his sacrifice for salvation, not in the works of the law or anything else. I don't think God is looking to catch us up on technicalities to send us to eternal punishment like some paint a picture of him, including the fellowship I belonged to as a young person.
Would you call King James 'James?' Would you call the the President 'Barack?' I'm just trying to figure why do people disrespect Gods names by calling Him by his name like this. To my understanding even the True Jews knew this and didn't call him by his name like he was a simple commoner He was God Almighty, Jehovah the true Jews had enough sense to not call him like that. I've never called my father by his first name.
Not saying God doesn't hear us if we do this or that this is a sin just something I think about lol help me out