[Air Force Born]

I thought it was Spanish for "little war." Guerro meaning war, adding the 'illa' makes it diminuative. I like the visual of calling them Gorillas. Sort of the same skill at war.

[epluribus_2]

that would be guerrita. guerrilla is "one who wars". Funny thing about the word guerra. It derives deeper back in spanish history to gothic/germanic rule from warra (war) but spanish routinely replaced W sounds which were somewhat foreign (theirs sounds more like a b) with GW/GU.
(end of historical linguistics post)