YachiYachi is a surname. Notable people with the surname include:Kento Yachi, Japanese baseball playerShotaro Yachi, Japanese diplomatYusuke Yachi, Japanese race walkerFictionalHitoka Yachi, the second manager of the Karasuno High School Volleyball Club in Haikyu!!Madoka Yachi, a mother of Hitoka Yachi in ''Haikyū!!''