Alright, so. A while back I learned that there are, in real life, a Ket people and a Ket language1, and I've been thinking about what to do with that information. I am pretty attached to the terms in my conlang, but I can't reasonably just ignore this, especially considering that the people and language are endangered and that I'm using the term to describe non-humans. It would be like if I accidentally called my language "thai" -- a reasonable mistake to make, in a universe where thai isn't a commonly-known language, but one that needs corrected. In the extremely unlikely scenario that my conlang becomes famous, I don't want to be stealing this name from somebody.2
But the question remains of how to fix it.
In decreasing priority:
Change the name of the ket species
The new name has to have a phonology predictable to English-speakers while following Teket spelling rules ("c" in Teket words is pronounced like "ch" in English, for example, so "kec", meant to be pronounced "ketch" but more likely to be pronounced "kek", is a no-go)
Specifically humans in-universe and the narration have to use the new name
The new name and any other terms that needed to change, both sound and look good to me
The change should leave the current Teket dictionary as intact as possible. There are several words derived from the species name, these either need to change with the species or have a plausible reason for staying the same
Point two unfortunately rules out a change that would almost be perfect -- changing to /kɛɾ/, which would need to be spelled "ker" and which therefore would result in people pronouncing it "kirr" (/kɪɹ/). The difference in that 'r' is that the latter is what you likely think of as an 'r' as an english-speaker (every 'r' in that sentence is /ɹ/), and the former is a tap where you bring the tip of your tongue up behind your teeth briefly to pronounce it. It's often transcribed 'd' and I could change the spelling conventions of the language to call them keds and get people to mostly get the pronunciation right -- but I hate how that looks. Teked Lau. Seiked. Cuked. Awful, it feels like they have stuffy noses.
So that's out, and the same rule also rules out some other letters that are used for a different sound than an English-speaker would expect: r, c, ch, vh, and any doubled vowels (aa, ee, ii, uu)
I considered 'kel', but the pluralising suffix '-al' (making kelal) is displeasing, so I also considered changing the suffix to '-at' (making kelat, seikelat, luenat, marhuniat, etc), but ultimately I don't like that. Could change the suffix to something else, and may consider it, but right now this one is not a top runner.
"kes" was considered and discarded because I don't like how it looks. "kest" was considered and discarded because I don't like how it combines with suffixes, though the resemblance to English superlative is tempting.
"ken" has been considered, but I don't like how it changes the derived words.
"keit" is a top-runner because I can get away with keeping the dictionary the same and saying the diphthong's been reduced in derived words. I'm also considering just switching the letters around and making them teks.
Another option in my sleeve is to keep them kets in the ket language but have humans call them something different and blame language drift. (This happened with the yen in Japanese -- when English (well, Portuguese-speakers) made contact with them, the え was pronounced "ye", but now it's "e", so the yen is "yen" in English but "en" in Japanese. The more you know). Or have whatever the original term for the species was be fossilised in the language but have derived terms &c have drifted.
Obviously I haven't actually decided on anything, yet, but those are the options I've largely come down to. I'll probably test them out before settling on one I think I'll like best. If anyone has any opinions on the matter I'd be happy to hear them
1Genuinely at a loss for how I didn't find this out before I settled on the name, I almost always search terms like this before naming things for exactly this reason. At a guess I just searched "ket" with no further descriptors, which puts the people and language Very low in search results and brings up other-language results before it does the relevant wikipedia pages.
2Imagine you were a member of a little-known group of Klingon people living on a mountain somewhere, and everyone's first thought when hearing about you or your language was the Star Trek aliens. People are learning "Klingon" but it's some fantasy Klingon. Awful.