Source : Webster's Revised Unabridged Dictionary (1913)

Bey \Bey\ (b[=a]), n. [See {Beg} a bey.]
   A governor of a province or district in the Turkish
   dominions; also, in some places, a prince or nobleman; a beg;
   as, the bey of Tunis.

Source : WordNet®

bey
     n 1: (formerly) a title of respect for a man in Turkey or Egypt;
          "he introduced me to Ahmet Bey"
     2: the governor of a district or province in the Ottoman Empire