Gwendolen

Possibly means "white ring", derived from Welsh gwen meaning "white, blessed" and dolen meaning "ring, loop". This name appears in Geoffrey of Monmouth's 12th-century chronicles, written in the Latin form Guendoloena, where it belongs to an ancient queen of the Britons who defeats her ex-husband in battle [1]. Geoffrey later used it in Vita Merlini for the wife of the prophet Merlin [2]. An alternate theory claims that the name arose from a misreading of the masculine name Guendoleu by Geoffrey [3].

This name was not regularly given to people until the 19th century [4][3]. It was used by George Eliot for a character in her novel Daniel Deronda (1876).