Waheguru ji ka khalsa waheguru ji ki Fateh.
Off hand this use of aunkar and siharee in GURBANI is the unique "gurbani grammar"...
The main NANAK ( nanna, kanna, nanna, kakka ) is Guru Nanak Ji.
The second Nan(i)k nanna, kanna, siharee, kakka..is used to denote NANAK NE.
Example in simple Punjabi: Eh paani kihnee dohlia hai ? Who spilled this water ?
The answer in Punjabi would be: Nan(ik)...meaning NANAK
NE panee dohliah.In English this SIHAREE would be
:"BY"...This water was spilled
BY Nanak.
Gurbani tuk" sach naam kartar su dirrh nan(i)k sangrihiuh... THe True Naam of KARTAR was DDirrh revealed
BY nanak
The use of the aunkar at the end of certain words comes due to transition of Sanskrit vocabulary and sanskrti grammar into Punjabi...the aunkar denotes soemthing grammarians call Accusative Singular/Plural. The aunkar can mean "FROM"...Simple example as above: Question - Eh paani kis ton dulliah ? Who spilled this water... Answer: Nanna, kanna,nannna kakakk(aunkar) means: Nanak ton The Water got spilled from Nanak ( Accusative Verb)..
The whole thing is very very complicated. IF you can do get hold of the Book: Gurbani Grammar by Prof sahib Singh ( it is in Punjabi). It is a 450 page book that explains all the Grammar used in gurbani that makes GURBANI unique in Punjabi Literature. Noteworthy is that our Guurs used "punjabi Grammar" to change words borrowed from Sanskrti/F{censored}e etc.
Before Prof sahib Singh came out with his GURU DARPAN and proper systematic explanation of the UNIQUE Grammar used in GURBANI, it was generally thought that the siharee aunkars used in Gurbani were "superflous". In fact Macauliffe went to the Head Priests and Gyanis of his time to elarn why these were used in Gurbani and the answer he got was" we dont know...they are just there, we suppose. Worse those Groups and Jathas claiming to be the original teachers of Gurbani were stressing on Saying Gurnani as it is Written...stressing on PRONOUNCING the Siharees and Aunkars as and when they ocurred.... for example SHAH(aunkar) is PROPER NOUN denoting SHAH a moneylender/banker/rich man..reference to WAHEGURU..is to be pronounced SHAH..and NOT as "SHAH UH" ... The word SHAH_HU has NO MEANING and doesnt EXIST...and it is a travesty to pronounce it like that..YET thousands of paathis who have learnt paath from traditionals read this Tuk (just before Slok mah Novaan begins) as SHAH_HU with a LONG drawn out HAEK... SHAH_huuuuuu... similarly SATGU(i)R means SATGUR NE..BY SATGUR.....and to pronounce it as SATGUREH is wrong as NO such word exists and it has no meaning.
Now that the Gurbani Grammar has become common knowledge, and Prof sahib singh's Darpan has made things very clear, the TRADITIONAL Groups are also changing their TUNE..and saying they knew all along about this VIAKARAN !! Strange but true ??? IF they really descend direct from Guuru Gobind Singh Ji ( Heard Gurbani AArths direct from guru ji)..
and knew this all along then why teach wrong pronounciations and tell macauliffe that these aunkars siharees are superflous.
Jarnail Singh