Easton's 1897 Bible Dictionary:

Abednego
   servant of Nego=Nebo, the Chaldee name given to Azariah, one of
   Daniel's three companions (Dan. 2:49). With Shadrach and
   Meshach, he was delivered from the burning fiery furnace
   (3:12-30).


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

Abednego, servant of light; shining