There are two Gihons mentioned in the Bible. The first Gihon is Eden's river number two (the others are Pishon, Haddakel and Parat). Of this river it is said that it flows around the whole land of Cush.
The second Gihon mentioned in the Bible is a place near Jerusalem where Solomon is anointed king (1 Ki 34). Apparently this Gihon is some kind of waterway, as king Hezekiah reroutes its course (2 Chr 32:30).
The name Gihon is derived from the verb (giah 345) meaning to burst forth. As such the name Gihon may be kindred to the name Gaham.
TWOTOT calls the river the Gusher, or Bubbler. Jones reads Great Breaking Forth (Of Waters). NOBSE reads Bursting Forth.