In the article entitled Fénidecht I explain that the fiana are part of an Indo-European cultural phenomenon that have been associated with wolves and werewolves, also called ‘wolf warriors’ (McCone, Werewolves, Cyclopes, Diberga, and Fianna: Juvenile Delinquency in Early Ireland, 1986, p. 16). If you do a search for other examples of this institution you will find warrior hunter gods to which these groups were associated, but not for the fiana. This could be due to the fact the Irish had an oral tradition, and stories of their gods did not start to get written down until the 5th century by Christian scribes who altered and hid the mythologies while other Indo European people were writing down their stories or would be writing them down before Christianity could fully take hold of the culture. It could be that the Irish did not have a deity associated with the wolf warriors, but that is unlikely given that hunting and warrior bands were a core part of Irish culture and other Indo European (IE) cultures have stories of such gods. No, I suspect the truth is that the Irish god of the ‘wolf warriors’, the hunt, and wild places is the well-known deity turned hero, Finn mac Cumall.