From Germanic 'gisil' meaning pledge or hostage, borne by medieval nobility.
Gisela comes from the Old High German *gisel*, meaning a hostage or pledge — specifically, the aristocratic children exchanged between rival powers as living guarantees of diplomatic agreements in the early medieval world. Far from being a grim origin, it carried enormous dignity: to be a *gisel* was to be valuable enough that your safety enforced peace. From this root emerged a cluster of names — Giselle, Gisela, Gizela — worn by noblewomen across medieval Germany, France, and Hungary.
Gisela of Bavaria, sister of the Holy Roman Emperor Henry II, became Queen of Hungary in 1000 CE when she married Stephen I, later canonized as the patron saint of Hungary. Her role in spreading Christianity throughout the kingdom and supporting the construction of churches earned her veneration in her own right. The name also appears in the form Giselle in the celebrated Romantic ballet of 1841, where a peasant girl of that name becomes a spirit of the forest — a story that has kept the name's musical and ethereal associations alive across ballet companies worldwide.
Gisela is the more Germanic, grounded spelling of the family — it lacks Giselle's ballet-stage shimmer but carries a different kind of seriousness. It was common throughout the German-speaking world and among German immigrant communities in nineteenth-century America, and it has returned to modest but growing use among parents who want something unmistakably European, vintage, and feminine without being either overly fussy or predictably popular. It ages gracefully from childhood through a long life.