Just for kicks, I looked in my 1920s vintage OED to see if it included geographical names, and it didn’t. However, I did find that that where the word “Esthonia” would be, the preceding was was “esthiomene,” which it described as an obsolete term for a gangrenous sore. Wikipedia has a different definition for it. . . but you just might not want to look it up during work.
Edit:
I remember once on Johnny Carson’s “Tonight” show *Orson Bean was a guest, and he was showing a more phonemic alphabet for English. Unfortunately the only letter I remember was the ‘th’ letter, which looked a lower case h with a little taller ascender but with a crossbar. I remember him showing how the word ‘throughout’ would be spelled, but aside from the beginning letter, I don’t recall. Also don’t recall if there were voiced and voiceless letters for it, but I suspect not.
*Well, he was one of Johnny’s favorites, so he was a frequent flier.