Someone please shed light on various spellings of 'naam'

I came across these variations in spelling of 'naam' in Sukhmani Sahib, can someone please shed some light on what these variations are referring to?

ਨਾਮ
ਨਾਮਿ
ਨਾਮੁ

Are there any other variations? I have heard that Bhai Joginder Singh Talwara Ji's 'Gurbani diyaan Laga Maatra Di Vilakhanta' goes over these kind of variations. But that book requires a lot of time. It would be nice if someone can point out most common variations in Gurbani which are due to lagga maatras.

Can someone please shed some light?
was wondering the same after noticing these differences in Sri GuruBani Ji

Chota veer

ਲਖੁ ਲਖੁ ਗੇੜਾ ਆਖੀਅਹਿ ਏਕੁ ਨਾਮੁ ਜਗਦੀਸ ॥
lakh lakh gaerraa aakheeahi eaek naam jagadhees ||
I would repeat, hundreds of thousands of times, the Name of the One, the Lord of the Universe.

ਤਿਨ ਕੇ ਨਾਮ ਅਨੇਕ ਅਨੰਤ ॥
thin kae naam anaek ananth ||
Their names are uncounted and endless.

ਸਹਜੇ ਹੀ ਹਰਿ ਨਾਮਿ ਸਮਾਇਆ ॥੩॥
sehajae hee har naam samaaeiaa ||3||
They are intuitively absorbed into the Lord's Name. ||3||

Let us try to note the relation between meanings and spellings of the word at different places.

ਹਰਿ ਕਾ ਨਾਮੁ ਜਨ ਕਉ ਮੁਕਤਿ ਜੁਗਤਿ ॥
har kaa naam jan ko mukath jugath ||
The Name of the Lord is the path of liberation for His humble servants.

ਹਰਿ ਕੈ ਨਾਮਿ ਜਨ ਕਉ ਤ੍ਰਿਪਤਿ ਭੁਗਤਿ ॥
har kai naam jan ko thripath bhugath ||
With the food of the Name of the Lord, His servants are satisfied.

ਹਰਿ ਕਾ ਨਾਮੁ ਜਨ ਕਾ ਰੂਪ ਰੰਗੁ ॥
har kaa naam jan kaa roop rang ||
The Name of the Lord is the beauty and delight of His servants.

ਹਰਿ ਨਾਮੁ ਜਪਤ ਕਬ ਪਰੈ ਨ ਭੰਗੁ ॥
har naam japath kab parai n bhang ||
Chanting the Lord's Name, one is never blocked by obstacles.

ਹਰਿ ਕਾ ਨਾਮੁ ਜਨ ਕੀ ਵਡਿਆਈ ॥
har kaa naam jan kee vaddiaaee ||
The Name of the Lord is the glorious greatness of His servants.

ਹਰਿ ਕੈ ਨਾਮਿ ਜਨ ਸੋਭਾ ਪਾਈ ॥
har kai naam jan sobhaa paaee ||
Through the Name of the Lord, His servants obtain honor.

ਹਰਿ ਕਾ ਨਾਮੁ ਜਨ ਕਉ ਭੋਗ ਜੋਗ ॥
har kaa naam jan ko bhog jog ||
The Name of the Lord is the enjoyment and Yoga of His servants.

ਹਰਿ ਨਾਮੁ ਜਪਤ ਕਛੁ ਨਾਹਿ ਬਿਓਗੁ ॥
har naam japath kashh naahi bioug ||
Chanting the Lord's Name, there is no separation from Him.

ਜਨੁ ਰਾਤਾ ਹਰਿ ਨਾਮ ਕੀ ਸੇਵਾ ॥
jan raathaa har naam kee saevaa ||
His servants are imbued with the service of the Lord's Name.

ਨਾਨਕ ਪੂਜੈ ਹਰਿ ਹਰਿ ਦੇਵਾ ॥੬॥
naanak poojai har har dhaevaa ||6||
O Nanak, worship the Lord, the Lord Divine, Har, Har. ||6||

For detailed explanaion by Veer Ji, please see [gurmatbibek.com]

Thanks bhai sahib jio for spending the time to write on this topic.