Hinduism&Islam UNITED!!!! What is TRUE NAME of GOD above all prevalent attributive Names of God?

Allah is not confined to 99 Glorious Names. Could not be. According to the hadith the Muslims are exhorted to encompass and comprehend 99 of His Great Names. The Muslim scholars delved deep into this exhortation and prepared Lists of 99 according to own preferences. If all the 14 Lists are put together, the Beautiful Names exceed 300. And it is correct to say that one or more Names are held by Allah Himself to be revealed to some at some time, such as the promised revelation of a Name to the Holy Prophet on the Day of Judgement. 'Om' is not said to be found in Vedas. Parmatma, Parmeshwar seem to mean exactly the same as Allah. 'Rabb' is The Name popular among the Sikh fraternity and It is there in the Holy Quran also. The Glorious Names of Allah is a vast subject. Being brief in response I thank the asker for a brilliant question.