Boyd’s Bible Dictionary:
(middle). Son of Japheth, and progenitor of the Medes (Gen. 10:2).
Concise Bible Dictionary:
Son of Japheth and progenitor of the MEDES (Gen. 10:2; 1 Chron. 1:5). The Hebrew for Madai and Medes is the same.
Jackson’s Dictionary of Scripture Proper Names:
my measures: my garments: what is enough