Meaning of Vaheguroo

I went to sangat today, lots of Simran and lots of fun! It just reminded me of one of Bhai Gurdaas Jee's Vaars (1) where he expains one meaning of the word "Vaheguroo"

Bhai Gurdaas Jee Vaar 1

siqjug siqgur vwsdyv vwvw ivSnw nwm jpwvY]
duAwpr siqgur hrIikRSn hwhw hir hir nwm iDAwvY]
qRyqy siqgur rwm jI rwrw rwm jpy suK pwvY]
kiljug nwnk gur goibMd ggw goivMd nwm jpwvY]
cwry jwgy chu jugI pMcwiex ivc jwie smwvY]
cwroN ACr iek kr vwihgurU jp mMqR jpwvY]
jhW qy aupijAw iPr qhW smwvY ]

sathijug sathigur vaasadhaev vaavaa vishanaa naam japaavai||
dhuaapar sathigur hareekrishan haahaa har har naam dhhiaavai||
thraethae sathigur raam jee raaraa raam japae sukh paavai||
kalijug naanak gur gobi(n)dh gagaa govi(n)dh naam japaavai||
chaarae jaagae chahu jugee pa(n)chaaein vich jaae samaavai||
chaaro(n) ashhar eik kar vaahiguroo jap ma(n)thr japaavai||
jehaa(n) thae oupajiaa fir thehaa(n) samaavai ||aa||a||

In Satyug, Visnu in the form of Vasudev is said to have incarnated and ‘V’ Of Vahiguru reminds of Visnu.
The true Guru of dvapar is said to be Harikrsna and ‘H’ of Vahiguru reminds of Hari.
In the treta was Ram and ‘R’ of Vahiguru tells that rembering Ram will produce joy and happiness.
In kalijug, Gobind is in the form of Nanak and ‘G’ of Vahiguru gets Govind recited.
The recitations of all the four ages subsume in Panchayan i.e. in the soul of the common man.
When joining four letters Vahiguru is remembered,
The jiv merges again in its origin.

It's another amazing example where its shown that "Ik Onkaar", that God is one, is true. But it also shows that all the "gods" that exist, all the prophets throughout the ages are all one and part of the same primal soul, Paramathma.