Type Word Usage Old Celtic (Hypothetical) Meaning & History Celtic word meaning "sovereignty" [1]. Related ItemsDetails Other Languages & Culturesflaith(Old Irish) gulat(Old Welsh) Given Name DescendantsGladys(English) Gladys(French) Gwladus(Old Welsh) Gladys(Spanish) Gladys, Gwladys(Welsh) Sources & References Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Brill, 2009, page 425.