Source : Webster's Revised Unabridged Dictionary (1913)

Mirza \Mir"za\, n. [Per. m[=i]rz[=a], abbrev. fr. m[=i]rz[=a]deh
   son of the prince; m[=i]r prince (Ar. am[=i]r, em[=i]r) +
   z[=a]deh son.]
   The common title of honor in Persia, prefixed to the surname
   of an individual. When appended to the surname, it signifies
   Prince.