Thank you very much for the explanation. This sounds very interesting. I am an sayyid myself (Al-Hussaini tribe branch of Bani Hashim clan) and my family record is verified by Kitab al-Ashraf and by the Institute of Islam in Baghdad (the oldest in the world that is still in use today).
But I would never reveal that because then locals might think that I am an millionaire sheikh or something (which I am obviously not).

I have heard that a lot of people claim to be Sayyids in India/Sout West Asia that are not because they have not an old enough record of their lineage but I don't know if this is truth with all. But I know that most Sayyids in India/Afghanistan/Pakistan are orginally from Iraq and Yemen (Hadramawt province) but most are Shias.