Names, Surnames & Titles

The name Naseem

Q: The name نسيم is the correct spelling with one S or two SS ? Please give correct spelling. Also the name Naim is it Nuaym or Naim? And the name Hasan with one S or two?

Adding titles of respect like Sayyiduna in Dua, etc.

Q: regarding the word Sayyiduna. i understand this is a title of respect, but should we not stick to the original wordings of the Ahadith when making duaa etc. for example someone may add Sayyiduna, then Moulana. Someone will add Jalle Jalalahu when reading durood after the name of Allah. So someone else will add and add and the original will be distorted. The addition of such words implies that the original wordings are not respectful enough?