The name Kidron in the Bible
Kidron (in some translations known as Cedron) is the name of a brook near Jerusalem and there seems to be something ominous about this brook. David crossed it on his flight from Absalom, and after crossing it he went up the Mount of the Olives weeping (2 Samuel 15:23).
A thousand years later, Jesus crosses the Kidron (spelled Κεδρων; this is the only time that this brook is mentioned in the New Testament) and immediately after this, He is betrayed by Judas and enters the cycle that results in His crucifixion (John 18:1).
Jeremiah also uses the Kidron as a border, namely the outermost reach of what will be holy to the Lord (31:40). The Kidron is also the scene of one of the most thorough cleansings of religious Israel, when all the unjust altars and images were rounded up and destroyed (1 Kings 15:13 first, and then 2 Kings 23:4).
Etymology of the name Kidron
The name Kidron comes from the verb קדר (qadar), meaning to be dark or mourn:
The waw-nun extension serves to personify or localize the root; Kidron means Dark One.
For a meaning of the name Kidron, NOBSE Study Bible Name List reads Dark, Turbid. Jones' Dictionary of Old Testament Proper Names reads Very Black, Full Of Darkness.