CocoRosie began in Paris, France and formed by Sierra Casady (Rosie) and Bianca Casady (Coco) in 2003. Sierra and Bianca Casady are North American half-Cherokee sisters. Sierra, the older of the two, was born in Iowa, and Bianca was born in Hawaii. Their mother nicknamed them Rosie and Coco, respectively, from which their musical act takes its name. In 2003, Bianca was growing restless and decided it was time for a change. Leaving her apartment in Brooklyn to travel the world, she ended up at Sierra's apartment in Paris.