The Cutheans are not considered as a nation of the seventy languages, but they were the remnant of the five nations precious to the king, as it is said, "And the king of Assyria brought men from Babylon, and from Cuthah, and from Avva, and from Hamath and Sepharvaim, and placed them in the cities of Samaria instead of the children of Israel" (2 Kings 17:24).
Rabbi José said: He added four more nations to them, and they were in all nine nations, as it is said, "The Dinaites, and the Apharsathchites, the Tarpelites, the Apharsites, the Archevites, the Babylonians, the Shushanchites, the Dehaites, the Elamites, and the rest of the nations… set in the city of Samaria" (Ezra 4:9, 10).