Who lived in brazil before the european settlers arrived?

Indians. The name Indians is due to a misunderstanding of Portuguese that thought they had arrived in India. The Portuguese arrived in Brazil in the year 1500, but earlier, in 1492 Cristóvão Colombo had arrived in Central America thinking to have reached India to exchange products. Their mistake, they found native civilizations that had many advancements in astronomy... In Brazil over 5 million Indians lived there and were dizimated by the Portuguese. If you wish to learn more about it you can read the fiction book by Antonio Torres, "My dear Canibal" (free translation).