If your name is Hamza, here's who you're named after.
Hamza ibn Abd al-Muttalib was the Prophet's ﷺ uncle. This story of his last day comes from the most unexpected witness: Wahshi, the man who killed him.
Years afterwards, two visitors found Wahshi living in Hims, in Syria, and asked him to tell them how it happened. He did.
At Uhud, when a fighter stepped out from the Quraysh lines and called for anyone to face him, it was Hamza who came out to answer: "Do you challenge Allah and His Messenger?" Wahshi had been promised his freedom if he killed Hamza, and that day he did.
Later, Wahshi came to the Prophet ﷺ with the delegation from Ta'if. The Prophet ﷺ asked him: "Are you Wahshi? Was it you who killed Hamza?" He said: "It happened as you were told." And the Prophet ﷺ asked only this: "Can you keep your face out of my sight?"
After the Prophet ﷺ passed away, Wahshi went out to fight Musaylimah, the false prophet, hoping to make up for what he had done to Hamza. (Sahih al-Bukhari 4072)
That's how we know Hamza's courage that day: from the man who killed him.