Madai
Easton's Dictionary
Middle land, the third “son” of Japheth (Gen. 10:2), the name by which the Medes are known on the Assyrian monuments.
Smith's Dictionary
(middle land), (Genesis 10:2) is usually called the third son of Japhet, and the progenitor of the Medes; but probably all that is intended is that the Medes, as well as the Gomerites, Greeks, Tabareni, Moschi, etc., descended from Japhet.