It appears that Saad is one of the names that doesn't have nicknames, or is too short to be abbreviated further.
Saad is an indirect Quranic name for boys that means “happiness”, “blessedness”.
It is the name of many famous companions of the Prophet, peace and blessings of Allah upon him and his companions, such as Saad ibn Muadh, Saad bin Ubadah, Saad ibn Abi Waqqas. It is derived from the S-Ain-D root which is used in many places in the Quran.
This name is prevalent in all Muslim countries. Check out Saad family history on Ancestry.com.
Do you hate nicknames, or just hate the idea that someone other than you is going to decide what your child is actually called by shortening, say, Alexandra to Lexie?
Then check out these baby names that don't have nicknames on Nameberry.com.