Gymnophiona is the group of amphibians that includes the legless caecilians and all amphibians more closely related to them than to frogs or salamanders (the "stem-caecilians"). The name derives from the Greek words γυμνος ("gymnos", naked) and οφις ("ophis", snake), as the caecilians were originally thought to be related to snakes.
Caecilians were originally snakes.
Caecilians were never snakes. People used to believe they were related to snakes. That does not mean that they were ever snakes.