And then we saw Turk again in "Turkmenistan." Aha! And we knew that Turk is from French, Medieval Latin, Byzantine Greek, and goes back as far as Persian. Carries a meaning of strength, beautiful youth, barbarian, or robber.
Putting "Persian" in the search box of etymonline yielded 32 pages of words that are either directly from, or connected in some way to, this language. Here are a few entries that I found really interesting. You may like to explore some as part of your study of Ancient Persia!
Gems, Minerals, Pigments & Powders
Again, you can see trade routes figure prominantly here, so this etymology exploration would also be a good topic of study if you had a mixed-age homeschool family and a fifth grader was doing Ancient Persia and a third grader was doing Trade Goods & Currency and studying the Silk Road. As Doug says, you can't learn about etymology without learning history as well!