That name we know did not originally start with a "J" since there was no such letter.
The name He used was the same as the servant of Moses named "Joshua", so all we have to do to know the true name
is to pronouce the "J" with the correct "Y" and you have "Yahshua" whcih means "Yahweh is salvation".
Once again you can see the connecton with the Hebrew. "Like Father, LIke Son"
Hope this helps.