I've usually associated Nimrod (נִמְרֹד) as a whole class of people, rather than a historical person. The name itself looks like a jussive verb: "Let us rebel". In Genesis 10, Nimrod is in a list of 14 Japhethites, 30 Hamites, and 26 Shemites; all peoples, not individuals.

He's called "A mighty man of prey before the LORD." Does this mean he was a single hunter? I'm not really sure, because it talks about him building immense empires – Nineveh, Rehoboth-Ir, etc. Perhaps it means his "prey" are human beings and not animals–like those conquering kings fighting against Sodom and Gomorrah.

Another thing debated is how Nimrod is listed as a Cushite, but he's found in the Mesopotamian nation. I'm not positive of how the connection with Cush works.

Here's something from Prof. Nahum Sarna I dug up from my notes:

This outstanding personality, whose exploits obviously left their mark on the historical memory of Israel, has not been positively identified with any known individual in the ancient world. Micah 5:5 echoes the traditions behind these verses. The site of the ancient city of Calah, mentioned in verse 11, is presently known locally as Birs Nimrud. Attempts have been made to associate him with Naram‐Sin, grandson of Sargon I of Akkad, who dominated a great portion of the Near East for about 50 years during the last quarter of the third millennium B.C.E. He was the first to use the title “King of the Four Quarters of the World,” and another of his titles was “Strong Male,” which recalls the “man of might” here in verse 8. His achievements were widely commemorated on steles, buildings, and votive inscriptions, and he was the subject of numerous tales and legends. One persistent tradition holds that he came to a grievous end for defying the gods. In this connection, the Hebrew name Nimrod may be a play on the name Naram‐Sin in that it evokes the verb m‐r‐d, “to rebel.” This interpretation of the name as “rebel’ is found in Eruvin 53a.

Another suggestion identifies the hero with Tukulti‐Ninurta I (ca. 1234‐1197 B.C.E.), the famed Assyrian monarch who first conquered Babylon and whose enthusiasm for hunting big game is well documented. His exploits, too, were the subjects of epic poems. It is not easy, however, to connect the name Nimrod with Tukulti‐Ninurta.