>>212707979
No one knows i believe. Both names are related to native languages (Guaraní mostly), but theres not one exact answer. Both names belong to rivers too, so they probably mean something like 'Bird's river' or some shiet like dat.
>>212703295 (OP)
I think it's pretty cool that they speak guarani, I don't know how much they use it daily though, maybe they speak with each other in spanish