The name Urim in the Bible
The Urim is one of two enigmatic items that were placed in the breastplate of the high priest, the other one being the Thummim (Exodus 28:30). We don't know what they were or what they were made of but the Urim and the Thummim were somehow used to consult God (Numbers 27:21, 1 Samuel 28:6).
Etymology of the name Urim
The word Urim comes from the root-verb אור ('or), meaning to be light or to shine:
Urim is a regular plural and means Lights or Flames.