Smith's Bible Dictionary
Gol'gotha. (skull). The Hebrew name of the spot at which our Lord was crucified. Matthew 27:33; Mark 15:22; John 19:17. By these three evangelists, it is interpreted to mean the "place of a skull". Two explanations of the name are given:
(1) that it was a spot where executions ordinarily took place, and therefore, abounded in skulls; or
(2) it may come from the look or form of the spot itself, bald, round and skull-like, and therefore, a mound or hillock, in accordance with the common phrase - for which there is no direct authority - "Mount Calvary." Whichever of these is the correct explanation, Golgotha seems to have been a known spot.
These files are public domain.
Smith, William, Dr. Entry for 'olgotha'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/o/olgotha.html. 1901.