Yasutora Sado (茶渡 泰虎, Sado Yasutora) is a teenager who studies in the same class as Ichigo Kurosaki. Because Ichigo first read Yasutora's name off a nametag, he pronounced his family name as Chad (チャド, Chado) due to the kanji, and Ichigo continues to call him this throughout the story. (Wikia)