Ever since I started learning Portuguese, I wondered what "janeiro" meant because I wanted to know what "Rio de Janeiro" meant. There's a city called "River of January"!
Check out Brazilian history (the time of discovery/exploration) for the story of how it got its name. We learned about it, but I don't remember the details.
why doesn't "go back" work as a translation for this sentence, but "return" is correct?
voltar = go back, return, come back, so your answer should be accepted!