Boila
Boila was a title worn by some of the Bulgar and Göktürk aristocrats in the First Bulgarian Empire and Second Turkic Khaganate. For the linguists, the title "Boila" is the predecessor or an old form of the title "Bolyar".
The Boils were two types: internal and external. The internal Boils were governors of the Comitates .Etymology
Most of the popular linguists believe that "Boila" has old-Turkic origin and the meaning of the word can be translated as "noble".