Gichon means "bursting forth" or "gusher," from the root giach (to burst out). It is the name of (1) one of the four rivers flowing from Eden (Genesis 2:13) and (2) the spring on the eastern slope of Jerusalem, which David and later Hezekiah used strategically. Both uses carry the sense of abundant, life-giving water breaking forth unexpectedly.
Water breaking forth is one of the Bible's richest theological images. The Gihon spring made Jerusalem habitable and was the site of Solomon's anointing as king (1 Kings 1). Hezekiah's tunnel (still accessible today) redirected Gihon's waters inside Jerusalem's walls — an act of faith and engineering before the Assyrian siege. The Eden Gihon connects to the eschatological river of life (Revelation 22:1-2): water flowing from God's throne to water the whole earth. Christ is the living water who causes springs to burst forth in the dry soul.