Actually Gaucho comes from Cauchu meaning Wanderer, but could come from

کائوچو

or Caoutchouc which is the rubber (plastic) coming from the tree!

Etymology:

"There are several hypotheses concerning the origin of the term. It may derive from the Spanish term chaucho, in turn derived from a Turkish low-rank military term Chiaus, through Arabic Shawsh which became broadly applied to any guard/watcher or aide.[9] The first recorded use of the term dates to Argentine independence in 1816. Another scenario indicates the word may derive from the Portuguese gaudério, which was designated to the inhabitants of the vast regions of Rio Grande do Sul and Río de la Plata in the 18th century or the Portuguese garrucho that points to an instrument used by the gauchos to trap and hamstring cattle. The 18th century chronicler Alonso Carrió de la Vandera speaks of "Gauderios" when it mentions the Gauchos or "Huasos" as poorly dressed men.

My favorite connection so far is CASA and KASHANEH... کاشانه

I've heard (no research) that Naranja (orange) comes from the Persian word Naranj (so does the word orange). Also the Latin word morte comes from the Persian word "mord."

I googled "list of Spanish words with Iranian origins" and got a link.  As it says some of them have Avestan or Arabic origins, but quite a few seemed familiar, such as parche, mate, pijama, divan, etc:

https://en.wikipedia.org/wiki/List_of_Spanish_words_of_Iranian_origin

Very cool. Thanks Bambi. It seems incomplete. For instance "joven" also comes fom "javaan" in Persian. I wish there was some explanation or an example of the Persian root for each word.