Meaning unknown, possibly of Akkadian origin or possibly meaning "rebel" in Hebrew. In the Old Testament
Nimrod is a renowned hunter, the great-grandson of Noah
. He was the founder of Babylon.
Due to the biblical character, this name was adopted as an English-language vocabulary word meaning "hunter". In American English it acquired a further meaning of "fool", after the oafish cartoon character Elmer Fudd (a hunter) was called such by Bugs Bunny.