White Canary is an alias used by vigilante Sara Lance in the Arrowverse. Lance originally used the alias Canary, until her death and her resurrection in a Lazarus Pit. She began using the new alias, as her sister Laurel Lance had become the Black Canary. In the regular DC Universe there is also a villain named White Canary who fights the Birds of Prey.
White Canary was created by Gail Simone and Ed Benes, first appearing in Birds of Prey (Volume 2) #1. (2010) Sara Lance became White Canary in the DC's Legends of Tomorrow episode, Pilot, Part 1. (2016)