Where does Toucan (the word) come from?
The word toucan comes from the Tupi–Guarani lands of southern Brazil and Paraguay. It began as the bird's name in Tupi or Guarani, Indigenous languages of the region, and reached English through Portuguese and French in the 1560s.
A name from Tupi and Guarani
In Tupi the bird was tukana or tuka, and in Guarani tukã. The two languages are close relatives in the Tupi–Guarani family, which once stretched along nearly the whole Brazilian coast and inland across the river basins of the south. Old Tupi was the language of the Tupi peoples of Brazil's coast. In his book Highlands of Brazil, Richard Burton wrote that the name probably imitated the bird's call, but the Oxford English Dictionary notes that other explanations have been offered.
Into Europe's languages
In the early colonial period Tupi served across Brazil as a common language between Europeans and Indigenous peoples, and Portuguese took the name as tucano. French had toucan by the 1550s and Spanish tucan, and English followed: Merriam-Webster dates the first known use to 1568. Naturalists also called the bird aracari, said to be another Tupi name; today it is the name of smaller toucans. In the 1590s the Flemish cartographer Petrus Plancius named a new southern constellation Tucana, after the bird.
Why people think of Central America
Toucans really do live in Central America. The family's more than 40 species range from southern Mexico through Central America and into South America as far as northern Argentina, mostly in lowland tropical forest. They seldom cross water and never reached the islands of the West Indies. But the name used across Europe came from the south, from speakers of Tupi and Guarani in Brazil and Paraguay.
Sources: etymonline.com ↗ · merriam-webster.com ↗ · en.wikipedia.org › Toucan ↗ · en.wikipedia.org › Tucana ↗ · en.wikipedia.org › Tupi language ↗