Syed (also spelled Sayed) is a given name derived from the title Sayyid, which is pronounced Sy-ehd.
Sayyid (Arabic: سيد‎) (plural sādah Arabic: سادة‎) literally means Mister. As an honorific title, it denotes males accepted as descendants of the Islamic prophet Muhammad through his grandsons, Hasan ibn Ali and Husain ibn Ali, sons of the prophet's daughter Fatima Zahra and his son-in-law Ali ibn Abi Talib.[1]

In the Arab world, it is the equivalent of the English word "liege-lord" or "master" when referring to a descendant of Muhammad, as in Sayyid John Smith. [2] This is the reason the word sidi (from the contracted form sayyidī, 'my liege') is used in the Moroccan dialect of Arabic.[3] Some Sayyids take the title Sheikh.

Greetings to you site with no clue,

No, no, no. Saadeh means happiness. It also isn't Muslim, it's Arabic because you know, there are Arab Christians as well as Muslims. Shocking, I know. The origins you have are all wrong. "Sayyid" and "Saadeh" couldn't be any different, it comes from the word "said" which means happy, similar to the last name "Saideh". I don't know where you guys did your research, but you probably shouldn't get your information from there. In fact, you know what? I'll give you an offer you can't refuse. I'll write the description for it because clearly there seems to be some sort ineptitude with your descriptions of last names with Arabic origins.

I shall forgive you guys this time, however, if I see this crock of crap again, oh man, you know you guys will get another comment declaring you change the description. In fact, you guys should change the description on this last name. Much appreciated.

With the utmost warmest regards,

JimboFisher