i believe the term "Yahoo" actually originates with Jonathan Swift in "Gullivers Travels" and was applied to a fictional race he based on William Dampier's description of Australian aborigines
https://en.wikipedia.org/wiki/William_Dampier
Dampier was the first man to circumnavigate the world three times. the first by accident, in the process discovering Australia 100 years before Cook
he is also believed to be the inspiration for the "Rhyme of the Ancient Mariner"
and he was the man who abandoned Alexander Selkirk (and so inspired Robinson Crusoe)