zabid is in tihama, yemen, where our master is from radyAllahu 'anhu zubayd is the ancestor yemeni tribe of most of the newer Iraqi Sunni tribes that dominate much of Iraq today for example, the dulaimis, the zuba'a, the janabi etc
i heard someone pronounce the sayyid's name as zubaidi and asked a brother to clarify. he said that it is zabidi due to his hometown: http://en.wikipedia.org/wiki/Zabid