What is the validity of considering the word "Ah" [أَهْ] to be one of Allah's Most Beautiful Names, which some Sufis repeat in their dhikr and حضرات (gatherings of remembrance)?

The names of Allah are divinely ordained (tawqifiyyah) and beautiful (husna). Therefore, Allah can only be named with what He has named Himself, or what His Messenger has named Him. Every one of His names is beautiful and indicates perfect attributes. Hence, naming Allah with a word that has no meaning, or with which He has not named Himself, is considered a form of deviation concerning His names (ilhad fi asma’ih), and it is unanimously prohibited. Any remembrance (dhikr) that does not conform to what is found in the Quran and Sunnah (definition) is considered an innovation (bid'ah) and is rejected against its perpetrator, because it is an alteration in religion and a distortion of Allah's names, and it is one of the most abhorrent and prohibited innovations.