bey 
(bā)
(bā)n.
1. A provincial governor in the Ottoman Empire.
2.
a. A ruler of the former kingdom of Tunis.
b. Used as the title for such a ruler.
3. Used formerly as a title for various Turkish and Egyptian dignitaries.
[Turkish; akin to Old Turkic beg, chieftain, lord, perhaps of Middle Iranian origin (akin to Old Persian baga-, god, and Sanskrit bhagaḥ, gracious dispenser of wealth, lord, good fortune; see BHAGAVAD-GITA), or from Middle Chinese pεjk, lord, father's elder brother (source of Mandarin bó; from Old Chinese prâk, elder, clan head).]