Brother Bhoolea Jee,
indeed you have asked a beautiful and a quite a deep question.
One thing is clear, whatsoever name we can recite, read or write, can be traced in time and history, means it started at some point. And all the divine names, are descriptive attibutes/qualties/ of the Divine.
And as such, these are many, like Ram, Rahim, Khuda, God, Govind, Hari, Satnam, Bhagwant, Akal Purukh, Shabad, Nam, Dhur kee Bani, Sachee Bani, Amrit Bani, Akhand Keertan, and so on .....
WAH E GURU , is also a descriptive name of that ultimate Truth, where Wah stands for that wonderous being, who is Guru, the Aad Guru, Shabad or Nam, the creative force of all that exists seen or unseen.
But definetely, that Power Waheguru is not the word itself, for if it was so, how could a simple word which can be written or read, create all the limitless and countless creations upon creations ....
People tend to mistake Nam, for literally name.
Bhagat Kabir Jee in this respect says in the Bani:
ਬਾਵਨ ਅਛਰ ਲੋਕ ਤ੍ਰੈ ਸਭੁ ਕਛੁ ਇਨ ਹੀ ਮਾਹਿ ॥
Baavan Ashhar Lok Thrai Sabh Kashh Ein Hee Maahi ||
Through these fifty-two letters, the three worlds and all things are described.
ਏ ਅਖਰ ਖਿਰਿ ਜਾਹਿਗੇ ਓਇ ਅਖਰ ਇਨ ਮਹਿ ਨਾਹਿ ॥੧॥
Eae Akhar Khir Jaahigae Oue Akhar Ein Mehi Naahi ||1||
These letters shall perish; they cannot describe the Imperishable Lord. ||1||
ਜਹਾ ਬੋਲ ਤਹ ਅਛਰ ਆਵਾ ॥
Jehaa Bol Theh Ashhar Aavaa ||
Wherever there is speech, there are letters.
ਜਹ ਅਬੋਲ ਤਹ ਮਨੁ ਨ ਰਹਾਵਾ ॥
Jeh Abol Theh Man N Rehaavaa ||
Where there is no speech, there, the mind rests on nothing.
In another Ang, he again says:
ਬਾਵਨ ਅਖਰ ਜੋਰੇ ਆਨਿ ॥
Baavan Akhar Jorae Aan ||
The fifty-two letters have been joined together.
ਸਕਿਆ ਨ ਅਖਰੁ ਏਕੁ ਪਛਾਨਿ ॥
Sakiaa N Akhar Eaek Pashhaan ||
But people cannot recognize the One Word of God.
ਸਤ ਕਾ ਸਬਦੁ ਕਬੀਰਾ ਕਹੈ ॥
Sath Kaa Sabadh Kabeeraa Kehai ||
Kabeer speaks the Shabad, the Word of Truth.
ਪੰਡਿਤ ਹੋਇ ਸੁ ਅਨਭੈ ਰਹੈ ॥
Panddith Hoe S Anabhai Rehai ||
One who is a Pandit, a religious scholar, must remain fearless.
ਪੰਡਿਤ ਲੋਗਹ ਕਉ ਬਿਉਹਾਰ ॥
Panddith Logeh Ko Biouhaar ||
It is the business of the scholarly person to join letters.
ਗਿਆਨਵੰਤ ਕਉ ਤਤੁ ਬੀਚਾਰ ॥
Giaanavanth Ko Thath Beechaar ||
The spiritual person contemplates the essence of reality.
And as First Patshahee says right from the begining: Ik Oankar, Satnam.
This means, there is only One creator, which is the Nam and this Nam is Truth, means it never changes in its essence, and exists beyond the parameteres of time and space, which means, it has existed then when there was no time.
This Naam, is not something physical, nor astral, neither causal, but a highest level of Consciousness, which is Parbrahm, which means that Truth, which is beyond Brahm/Maya, thus eternal and Infinite.
The Bani says: Aapeenay aap sajeeo, apeenay racheeo Nao. This Nao/Nam, is the true nature or form of that ultimate Truth.
And that very Truth at our human level, came as Guru Sahiban, Gurmukh Jan, or Bhagat Jan of the highest level, such as those mentioned in Gurbani, in order to reveal itself in our human understandable language, as seen in the following verse:
ਗੁਰੁ ਪਾਰਬ੍ਰਹਮੁ ਪਰਮੇਸਰੁ ਆਪਿ ॥
Gur Paarabreham Paramaesar Aap ||
The Guru is the Supreme Lord God; He Himself is the Transcendent Lord
For if was not so, nobody can ever imagine even a tiny reality of it, we are already agyanis, lost in our own huge moorakhta, our reality is seen in the following verse:
ਤੀਰਥਿ ਭਰਮੈ ਰੋਗੁ ਨ ਛੂਟਸਿ ਪੜਿਆ ਬਾਦੁ ਬਿਬਾਦੁ ਭਇਆ ॥
Theerathh Bharamai Rog N Shhoottas Parriaa Baadh Bibaadh Bhaeiaa ||
Wandering around at sacred shrines of pilgrimage, the mortal is not cured of his disease. Reading scripture, he gets involved in useless arguments.
And they told us also, nobody can reach Him, without boarding the vessel of Nam.
Now the question is how to get hold of that Nam? Where is that Nam?
The answers to such questions are found within the Bani:
ਨਾਮੁ ਦ੍ਰਿੜਾਇਆ ਸਾਧ ਕ੍ਰਿਪਾਲ ॥
Naam Dhrirraaeiaa Saadhh Kirapaal ||
By the Kind Mercy of the Holy Saints, the Naam has been implanted within me.
Once that Name has been blessed on us, what are we supposed to do ?
Well, the Bani says: Jin Har japeeya, se Har hoeeya. Bani could never ever be so clear. The Bani says: do the jaap of that Nam alone , and you shall merge and become one with that Shabad/Nam. At other place, the Bani says: Jap mun Satnam, sadaa Satnam
In reality, whatever "word" or "name" is given to us by Guru Sahiban, has their power in it, to cleanse us and reunite us with our origin; it could be anything, as seen in the folloowing verse: Nanak das mukh se jho bholay , eehaa uhaa Sach hovay
So if Guru Sahiban (the embodiment of the highest Truth) say repeat or meditate on Waheguru or Satnam for example, that is most sacred mantra valid for us, for it is uttered by them, and bestowed as a blessing upon us.
By meditating and focusing alone on Nam as instructed by Guru Jee, we are able to withdraw our soul consciousness within ourselves to the higher spiritual realms, and gradually also wipe away all our total karmas / sanskaras, thus become that much pure/pavitar, to board on the jahaaz of Nam, thus reach our Nijh Ghar in Sach Khand, in the lap of Satnam.
All wadeeayee and mahima is of Guru and Gobind, the 2 aspects of the same Truth.
SSA.