With respect to “chaparral”, it seems to be generally accepted that the Spanish word is a derivative of “chaparro”, which is generally accepted as being from Basque. E.g., the current Spanish Academy dictionary (on-line) derives “chaparro” from Basque “txaparro”, while the dictionary from 1884 derives it from Basque “chabarra”. At a glance I don’t see anybody disagreeing, although as in many other cases it’s hard to tell how firm the etymology is.

What about “jai-alai”?

What about it?  Oecolampadius mentioned it in his first post (3rd in the thread).

So he did. My apologies to Oecolampadius. These old eyes are not as aquiline as they once were; more talpine, nowadays, sad to say.