He was a hero who cared for his people and a leader who fought along side his men to the end. But he saw the cost of his war and decided it was time to stop. He represents resistnance to oppression and what we must do, STAND UP AND FIGHT.
Did you know that the name Geronimo originates from "saint Jerome"? To use a analogy of why this is important is that a english equivalent would be a person shouting in shock in english "JESUS CHRIST!"
The name is basically a swear in horror that his enemies had to face him. Basically it's like whenever someone is scared they say "shit!" or "fuck me!", etc. You know someone is badass when the name given to them is basically your enemies being scared shitless.