Dumah
Easton's Dictionary
Silence, (comp. Ps. 94:17), the fourth son of Ishmael; also the tribe descended from him; and hence also the region in Arabia which they inhabited (Gen. 25:14; 1 Chr. 1:30).
There was also a town of this name in Judah (Josh. 15:52), which has been identified with ed-Domeh, about 10 miles southwest of Hebron. The place mentioned in the “burden” of the prophet Isaiah (21:11) is Edom or Idumea.
Smith's Dictionary
(silence).
A son of Ishmael, most probably the founder of the Ishmaelite tribe of Arabia, and thence the name of the principal place of district inhabited by that tribe. (Genesis 25:14; 1 Chronicles 1:30; Isaiah 21:11) A city in the mountainous district of Judah, near Hebron, (Joshua 15:52) represented by the ruins of a village called ed-Daumeh, six miles southwest of Hebron.