Eurasian nomads
As against this, Arnold J. Toynbee discusses the issue of two Persian names Kambujiya (Cambyses) as well as Kurush (Cyrus) at length and regards them both as derived from the two Eurasian nomads, the Kambojas and the Kurus mentioned in the Sanskrit texts and who, according to him, had entered India and Iran in the Volkerwanderung of 8th and 7th century BC.