Is it permissible for a sayyid woman [Hashemite, from the descendants of the Prophet (pbuh&hp)] to marry a non-sayyid man? Or, is it permissible for a sayyid man to marry a non-sayyid woman?
Marriage between a sayyid and a non-sayyid, men or women, is permissible in Islam. The criteria for a suitable spouse is faith and good character and morals.