from The Century Dictionary and Cyclopedia
- n. A benefactor: a title of honor in ancient Greece of such as had done the state some service, and sometimes assumed as a royal surname, as by Ptolemy III. of Egypt (Ptolemy Euergetes), and Ptolemy VII. (Euergetes II.).
Sorry, no etymologies found.
That inscription is carved on an octagonal statue base for a governor of Lycia-Pamphylia of Sagalassian origin, where he was member of the boule and hailed as "benefactor" (euergetes): (Aufidius) Coresnius Marcellus.