Fionn Mac Cumhaill

Fionn mac Cumhaill (/ˈfɪn məˈkuːl/ fin mə-KOOL; Irish pronunciation: [ˈfʲin̪ˠ mˠakˠ ˈkuːw̃əlːʲ];Old Irish: and Middle Irish Find or Finn, mac Cumail or Umaill), sometimes transcribed in English as MacCool or MacCoul, was a mythical hunter-warrior of Irish mythology, occurring also in the mythologies of Scotland and the Isle of Man. The stories of Fionn and his followers the Fianna, form the Fenian Cycle (an Fhiannaíocht), much of it narrated in the voice of Fionn's son, the poet Oisín.

"Fionn" means "blond", "fair", "white", or "bright". The hero's childhood name was Deimne (/ˈdeɪni/; Irish pronunciation: [dʲeβ̃nʲi]), literally "sureness" or "certainty", also a name that means a young male deer; several legends tell how he gained the name Fionn when his hair turned prematurely white. The name Fionn is related to the Welsh name Gwyn, as in the mythological figure Gwyn ap Nudd, and to the continental Celtic Vindos, a form of the god Belenus.

...
Wikipedia