You don’t know what you’re talking about.
There are Syed families throughout the Middle East. Just off the top of my head, the royal family of Jordan (as well as their cousins, the erstwhile royal family of Iraq) claim descent from the Prophet. So does the Moroccan royal family. Syed Qutb of Egypt; the Lebanese Ayatollah Fadlallah of Hezbollah; Ayatollah Sistani of Iraq; Ayatollahs Khomeni & Khamenei, Mir-Hossein Mousavi, Mohammad Khatami, and the former Shahbanou of Iran…all of them are of Syed descent.
The fact that you apparently haven’t heard of saadaat outside of South Asia doesn’t mean that they don’t exist.