Oh wow, that's what Fianna Fail means? "Soldiers of Destiny"... rofl. De Valera was quite the megalomaniac!
Anyway, someone's gotta mention the Macedonian parties.
Fianna is the band of warriors of Finn MacCumhaill
The Fenians were named after them, so De Valera didn't invent the connection to modern nationalists.
Warriors of Destiny is a better translation IMO.
It is not an unfitting name for a Nationalist party, it is just that FF degenerated so much.
Fál is one of a number of poetic terms for Ireland, so the best translation is arguably "Warriors of Ireland". The words also form part of the first line of the Irish language version of the national anthem (although when I was taught the words in primary school during a period of FG/Labour coalition government, the line
Sinne Fianna Fáil had been changed in the text-book to
Sinne Laochra Fáil - the civil war hadn't gone away, you know).
And speaking of Fine Gael, "Tribe of Gaels" suggests a group of dreadlocked, woad-spattered prehistoric hipsters banging bongo drums outside a teepee, rather than the reality of a pinstriped and blue-rinsed coalition of larger farmers and the bourgeoisie.