:: You have not proven anything about him being Arab.  You can not even demonstate one Arab colony from the historical region of Chorasmia.  None of the evidences we have given, has been refuted. When did you refute Biruni's statement that the people of Chorasmia are Persian? When did you refute Ibn Al_nadeem's statement that he came from Chorasmia? Do you have a counter evidence to Ibn Nadeem? What legitimate evidence do you have that Tabari made a mistake about the Al-Majoosi title? What evidence have you shown of even a single arab from Chorasmia (Khawarazimn and I am not talking about arab military garrison in Merv which is different region). What evidence have you shown that there is a high chance that an Arab would use Persian dates and calendars? In fact all of your arguments have no basis and I can use for example a similar argument to claim that many many Iraqi or Yemenese based scientists were Persians and come up with weired reasons. The fact of the matter is that you are bounded by the sources. Ibn Nadeem, Tabari, Ghazi Al-Andalusi, Abu Rayhan Biruni coherently prove that Khawarazmi was not Arab. Anyways wait till I compile all these four sources. You need evidence and not just very weak (in my opinion) couter arguments to ancient sources. When Ibn Nadeem mentions his Asl is Chorasmian, then the chances of his Arab ethnicity is reduced significantly. When Biruni mentions the people of Khawarazim are a branch of Farsi, then this is reduced more. Finally add the Persian calendar and dates and the Al-Majoosi title, and the chances of him being an Arab becomes virtually zero.