The meaning of Mash in the Bible
(From International Standard Bible Encyclopedia)

(mash): Named in Genesis 10:23 as one of the sons of Aramaic In the parallel passage in I Chronicles 1:17 the name is given as "Meshech" (meshekh), and the Septuagint (Mosoch) supports this form in both passages. "Meshech," however, is a Japhetic name (Genesis 10:2), and "Mash" would seem to be the original reading. It is probably to be identified with the Mons Masius of classical writers (Strabo, etc.), on the northern boundary of Mesopotamia.

See more on the meaning of Mash in the Bible:
Mash {Easton's Bible Dictionary}
Mash {Hitchcock's Bible Name}

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