The Spanish word 'chasqui' comes directly from the Quechua word 'chaski', which meant both 'messenger' and 'to receive'. Chasquis were an integral part of the Inca Empire's communication system - they were relay runners who carried messages and small packages across the vast network of Inca roads known as Qhapaq Ñan. The Spanish borrowed this word when they encountered the Inca civilization, maintaining its meaning of 'messenger' in Spanish colonial documents and modern usage.

Since 'chasqui' comes from Quechua rather than Latin or Greek roots, there aren't many etymologically related simpler Spanish words. This is common for words that Spanish borrowed from indigenous American languages.

There aren't any etymologically related English words since 'chasqui' comes from Quechua. While English has borrowed some words from Quechua (like 'llama', 'puma', and 'quinoa'), 'chasqui' remains primarily used in historical contexts when discussing Inca civilization.