This name was borne by the legendary Irish hero Fionn mac Cumaill, or Finn MacCool. He was noted for his courage and fairness, as well as for his able leadership of the Fianna, or Fenians, a storied band of warriors.
Scholars speculate on the sources of these legends. Some believe they evolved from myths about a Celtic god. Others believe Fionn/Finn was a historical figure who boldly opposed the Norse raids on Ireland in ancient times.