I will give you 3 explanations.
1. it is just coincidence. There are many "good" guys and "bad" guys and regular folks too in the bible who's name "fits" what they did, whose name doesn't fit what they did, or whose name seems to have no reflection on what they did. It's a fun game to look up the meaning of their names and see if it did or didn't fit what they did or who they were. By the way your name probably means something too, does it fit you?
2. Revisionist history/Character typing. Some of the bible seems to have been written to put together a history, sometimes lyrical and poetic, sometimes mythical or legendary. You only need to look no farther than Adam and Eve to understand what I mean. Adam meaning red earth or Earthling man or just "man" and Eve meaning "living one" as in she was made living are two proto-typical examples.
They seem to be names given to these characters after the fact as though the bible writers were assigning them these names not because they were really their names but because this was their CHARACTER or their mythic-type, or archtype.
And then again, some names were changed for example Abram to Abraham in order to render the meaning more appopriate to the action. Whether this was actually done by the person or by God or by the bible writers we do not know for certain.
Regarding Nimrod, who is probably a fictional or allegorical person, notice that the bible doesn't say that it was his actual name, but rather that he was "called Nimrod" which means "rebel". This describes his action or what he did or his character. If there was a real Nimrod he probably did not have that actual name but only later when the bible writers were passing down the story (first orally) was he "called" a rebel, from the Hebrew verb which meant rebel.
3. Names are prophetic and impact upon development.
I have a theory that a person's name can shape one's personality as they mature.
It is really quite simple. Every name, indeed every word in one's native tongue carries with it (like a portemanteau or suitcase) a whole array of psychological and emotional impact. We know this intuitively.
Further from a sociological perspective there is an inherent tendency for us to associate certain characteristics and personality aspects with certain names and this also feeds into the development of the personality as one matures.
What do names like Melvin, Daryl, Timmy, Arthur suggest to you?
What do names like Rex, Thurman, Tony, or Troy suggest?
What do names like Michael, David, Timothy suggest?
What kind of persons would you expect Shaniqua, La Shonda, or Patrice to be?
What about Billy Ray, Jim Bob or Bo?
You see even at a young age every name invokes a sense of weakness, strength, intellect or not, artistry, etc. And think about it, we are constantly, constantly called by our names from infancy.
It is inevitable and predictable to an extent what kind of person we might turn out to be with a given name.
In F. Herbert's Dune, sound itself, words, are turned into a weapon. There is power that is harnessed from the very meaning and sound of the words because there is power that resides within such. this reminds me of the scripture regarding that the Name of God is "fear inspiring" or powerful. Is it possible that the actual name of god (as correctly pronounced) had real power? Some believe so.
food for thought,