Easton's 1897 Bible Dictionary:

Gehazi
   valley of vision, Elisha's trusted servant (2 Kings 4:31; 5:25;
   8:4, 5). He appears in connection with the history of the
   Shunammite (2 Kings 4:14, 31) and of Naaman the Syrian. On this
   latter occasion he was guilty of duplicity and dishonesty of
   conduct, causing Elisha to denounce his crime with righteous
   sternness, and pass on him the terrible doom that the leprosy of
   Naaman would cleave to him and his for ever (5:20-27).

     He afterwards appeared before king Joram, to whom he recounted
   the great deeds of his master (2 Kings 8:1-6).


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

Gehazi, valley of sight