Dear Khalsa Ji,

It is after a long time that I have come back on net. I share with you what is my understanding of 'Naam'.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/jap-ji-sahib/625-japji-sahib-pauri-21-a.html

As I understand each word that we have in any language has some content, i.e. meaning. This meaning limits the word. 'The Sat' is umlimited, none of the word can convey what 'The Sat' means. When we say 'Naam' it conveys to any one the abstract entity that 'The Sat' is, and yet we have not contained the uncontainable 'The Sat' within any limit that any specific word would have done. The proof of this hypothisis is that when we use this word 'Naam' no image comes to our mind.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=625

It is the profound wisdom of Guru Sahib in using this word to refer to 'The Sat'.

With love and respect for all.

Amarpal Singh