Easton's 1897 Bible Dictionary:

Eshcol
   bunch; brave. (1.) A young Amoritish chief who joined Abraham in
   the recovery of Lot from the hands of Chedorlaomer (Gen. 14:13,
   24).

     (2.) A valley in which the spies obtained a fine cluster of
   grapes (Num. 13:23, 24; "the brook Eshcol," A.V.; "the valley of
   Eshcol," R.V.), which they took back with them to the camp of
   Israel as a specimen of the fruits of the Promised Land. On
   their way back they explored the route which led into the south
   (the Negeb) by the western edge of the mountains at Telilat
   el-'Anab, i.e., "grape-mounds", near Beersheba. "In one of these
   extensive valleys, perhaps in Wady Hanein, where miles of
   grape-mounds even now meet the eye, they cut the gigantic
   clusters of grapes, and gathered the pomegranates and figs, to
   show how goodly was the land which the Lord had promised for
   their inheritance.", Palmer's Desert of the Exodus.


Hitchcock's Bible Names Dictionary (late 1800's):

Eshcol, bunch of grapes