The Kushanas originated from the Yueh-Chi (Yuezhi) tribe, a nomadic people who were driven out of northwestern China by the Xiongnu and migrated to Bactria. One branch of the Yueh-Chi, the Kushanas, eventually established a vast empire in northwestern India and Central Asia under leaders like Kujula Kadphises, Kanishka, and Huvishka. The Gahadavalas were medieval Indians, Meghavahana was a Kushan king, and Pahlavas were Indo-Parthians - none of these are the correct tribal origin.