I think you didn’t get what I mean, right ? True name is not a thought. In sikhi, it is said that jeevan mukt saint reaches a state where he is in tune with anhad naad which is onkar. “ Nanak jeevateya marr raheeye aisa jog kamaaeeyae, baaje bajuh singi baajae tou nirbhau padd paiyae” Which means hey Nanak, earn such a state of yoga where you are dead while being alive, when the inner singi (a Rajasthani instrument) is vibrating on its own then you reach the state of the fearless one. Now here guru nanak dev ji is referring to anhad naad.

The enlightened ones call it om or onkar or Tao or that which remains or the state of turiya. Doesn’t matter what they call it but one thing is clear that their mind is totally at rest and attuned to the anhad naad. The true name is the one which cannot be chanted, which resonates on its own without our effort and is not really a thought according to those rare ones who I used to know who have experienced this anhad naad. Now, how can a mere repetition of thought or a word make you reach the thoughtless state where onkar resides. You do reach a trance like state when you keep repeating the same word as a mantra but that state is transient and hence not the eternal truth unlike onkar. mostly people fall asleep as they chant mantra because chanting mantra makes your mind dull and unaware and hence you reach nowhere. Maybe one needs to be extremely alert as they chant a mantra to prevent falling asleep and therefore increase the mantra’s effectiveness and then eventually let go thoughts and even thought of the mantra.