Ans.We do not know the personal name of God That is one of her secrets. Gods name is not Allah and Mohammed was not Gods prophet. Christians believe in three gods and Muslims serve a different god. Jesus was not the Messiah and he fulfilled no messianic prophecy. When the real Messiah comes, the world will be drastically changed.
Why should you want to know "Personal Name" of God?
In Quran we have the names Allah (which is Al Ilah and Eil is known to Jews) and Al Rahman (The Most Gracious and Most Merciful) as "Personal names of Allah).
Then there is a list of 99 Most Beautiful named and Quran says "Most beautiful names belong to God" .they could be in all languages of world.
Why then there is need to know "Personal name of God" and for what purpose?.
Jesus was indeed a Messiah, but not "The Messiah", Jews was waiting for.
After Jesus and our prophet the "Only" Messiah that is left to come is the "False Messiah" called Anti Christ by Christians and DAJJAL (The Great liar) in Muslim literature.
May be Jews would take him for Real Messiah and beome his followers.
That is what happens if you reject True Prophets of God, you get hooked on to wrong persons.