Means "bright pledge", derived from the Germanic elements gisil "pledge, hostage" and beraht "bright". The Normans introduced this name to England, where it was common during the Middle Ages. It was borne by a 12th-century British saint, the founder of the religious order known as the Gilbertines.

• Ernst Förstemann, Altdeutsches namenbuch (1900), page 638
  

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