The etymology of burrito is really obvious, but nobody stops to think about it, as it's basically become a single morpheme at this point. Since -ito is a Spanish suffix meaning "little", burrito means a "tiny burro", or a "tiny donkey" (pretty macabre; that's probably what kind of meat stuffed the original burritos). Burro comes from the earlier Spanish word with the same definition, burrico, which stems from Latin, as many Romance language words do; in this case from the word burricus, which was a type of horse- not much of a change. Since the burricus horse was tinted chestnut, it makes sense that burricus would come from the Latin word for "reddish-brown", burrus. By similar logic, since fire is sort of reddish, it also is unsurprising that this comes from the Greek word for "fire", pyrros. from pur ("fire"), which derives from the Proto-Indo-European term pehwr, or "bonfire". It's amazing how these three words, so hard to connect by heuristics, make perfect sense when considered from a step-by-step point of view.
Adam Aleksic, a leading contender for valedictorian of his high school, is a 208-month-old boy with disturbing interests in etymology, vexillology, geography, and law. Adam would like to one day visit Tajikistan and just won an essay contest on linguistics!
The Etymology Nerd