Here's why this is the most likely explanation:
* Historical context: The Mapuche people were the dominant indigenous group in central Chile before the Spanish conquest. Their language was widely spoken in the region.
* Linguistic evidence: The word "chili" is similar to other Mapuche words related to land and terrain.
* Usage by Spanish conquistadors: Early Spanish explorers and chroniclers used the term "Chile" to refer to the land and its inhabitants.
While other theories exist, such as a possible connection to the Quechua word "chilli" (meaning "cold"), the Mapuche origin is generally considered the most likely.