Meaning & Origin
Giselly is a feminine name, an elaborated spelling of Giselle or Gisele — from the Old German Gisel, meaning "pledge" or "hostage," originally referring to a child given as a pledge of peace between warring parties. Despite this origin, Giselle has become synonymous with grace and beauty through Giselle the ballet and model Gisele Bündchen.
Giselly's -lly ending gives it a warmer, more informal character than the standard Giselle. It's the same elegant name with a softer landing — the grace of the ballet in a more casual dress.