It has sometimes been regarded as the Welsh form of the name Claudia, though that association has been debated.
An increase in usage after 1990 is associated with the popularity of Argentinean singer Gladys Nelly del Carmen Jiménez, who performs under the stage name Gladys, la Bomba Tucumana.
[2] The name was also well-used in African and South American countries and elsewhere in the middle and late 20th century.
Other feminine names ending in the letter s were also in vogue in the late 19th and early 20th centuries.
Some sources have also noted the similarity in sound between Gladys and the etymologically unrelated words glad and gladiolus flower.