in this adjective for an elegant & gracious gentleman; it comes from the French for "of good family"
[DOC] [TLE] debonair - Wiktionary [PAR] adjective /dbn/ a) suave, urbane and sophisticated Let be that Ladie 
debonaire, ... debonair  [adj] charming, elegant affable, buoyant, casual, 
cheerful, ... from Anglo French deboneire, from de bon aire of good family or 
nature Date: ... 1. courteous, gracious, and having a sophisticated charm: a 
debonair gentleman.