As probably majority or even all of you are aware, (except the prefix name of Seyyed or Sayyid which means mister), there are many people (Muslims) who are named as Seyyed or Sayyid at the initial part of their names. (Commonly, at the initial part of their first name).
According to my average knowledge and also according to what I found during my researches, I figured out that Seyyed is related to the persons who are related to the grandfather of Prophet Muhammad (peace be upon him and his household), and even I saw it is related to the Shia Imam’s descendent based on
I am looking for a more authentic site in regard to the above mentioned matter. Well, more precise explanation concerning the mentioned matter would be appreciated.
Note: I'm looking for a Shiite site(s) (which has elaborated it)