Brazil is named after a tree.
Thus, the US could have been named after a tree or cactus for example. the United States of Saguaro. Problem is there were no Saguaro cactus in the Eastern US. Or at the very least name the US after one of its founding leaders. Or the Atlantic ocean, "New Atlantis".
it seems they stuck with America since it was a neutral name. After all, chances are the early states had there own ideas on what the new nation should be called. So to avoid any possible rivalry they picked a neutral name all would agree too.





