Nimrod is a theological concept.
Nimrod—An Insolent Rebel
Doubtless, Nimrod was the ringleader. Genesis chapter 10 introduces him as “a mighty hunter in opposition to Jehovah.” (Genesis 10:9) The Scriptures also say that “he made the start in becoming a mighty one in the earth.” (Genesis 10:8) Nimrod was a warrior, a man of violence. He became the first human ruler after the Flood, appointing himself as king. Nimrod was also a builder. The Bible credits him with being the founder of eight cities, including Babel.—Genesis 10:10-12.
Hence, Nimrod—an opposer of God, a king of Babel, and a constructor of cities—undoubtedly shared in building the tower of Babel. Did he not make a celebrated name for himself? Concerning the name Nimrod, Orientalist E. F. C. Rosenmüller wrote: “The name was given to Nimrod from [ma·radh′], ‘he rebelled,’ ‘he defected,’ according to the Hebrew meaning.” Then Rosenmüller explains that “Orientals are accustomed not rarely to call their noblemen by names given after death, from which comes the, at times, amazing agreement between names and things done.”
Several scholars share the opinion that the name Nimrod was not a name given at birth. Rather, they consider it to be a name given later to suit his rebellious character after it became manifest. For example, C. F. Keil states: “The name itself, Nimrod from [ma·radh′], ‘we will revolt,’ points to some violent resistance to God. It is so characteristic that it can only have been given by his contemporaries, and thus have become a proper name.” In a footnote, Keil quotes historian Jacob Perizonius as writing: “I would believe that this man [Nimrod], as a ferocious hunter and surrounded by a band of comrades, in order to incite the rest to rebellion, always had in his mouth and geminated that word ‘nimrod, nimrod,’ that is, ‘Let us rebel! Let us rebel!’ Hence, in later times, he was designated by others, even Moses himself, by that word as a proper name.”
Clearly, Nimrod did not make a celebrated name for himself. The name given to him at birth apparently is unknown. It has been erased from history, as have the names of those who followed his lead. He did not even leave any offspring to carry his name. Instead of receiving glory and fame, he has been vested with infamy. The name Nimrod has forever labeled him an insolent rebel who foolishly challenged Jehovah God.
w98 3/15 pp. 24-25
What is the origin of the name Nimrod? - Several scholars share the opinion that the name Nimrod was not a name given at birth. Rather, they consider it to be a name given later to suit his rebellious character after it became manifest.—3/15, page 25.
w98 4/15 p. 31 / Do You Remember?
Some believe that Marduk, who was regarded as founder of the Babylonian Empire, represents the deified Nimrod. However, this cannot be stated with certainty.
Pay Attention to Daniel’s Prophecy! (1999), chap. 5 p. 69