Two questions about the phrase Ikalian asteroid belt from the TNG episode The Mind's Eye: first, what is the Klingon name for Ikalia? I've attached a clip of Worf saying "Ikalian asteroid belt", although he appears to say "Ikanian" instead of "Ikalian". And second, how do Klingons refer to an asteroid belt?

The script says the pronunciation is ih-KAY-lee-n. Worf either knows an alternative pronunciation or maybe he just, uh, well…

This is one of those problems that comes up more often than one would like when working on a series: The script says one thing, the actor says another, and a later episode (sometimes a later speaker in the same episode) doesn't match the first speaker. As far as I know, in all of Star Trek, the word is spoken only once (by Worf, in the TNG clip you sent). However, it comes up a few times in Discovery, but in writing only (on star charts). According to Discovery, the star (or star system) is Ikalia. Though it’s not in Discovery, the relevant asteroid belt would be the Ikalian Asteroid Belt.

So, if you want to go by what the writer of the TNG episode intended, the English would be Ikalia / Ikalian (ih-KAY-lee-yuh / ih-KAY-lee-yuhn) and the Klingon would be ’Iqey’lIya’.

If you want to go by the way it was pronounced the only time it was ever pronounced, the English would be Ikania / Ikanian (eye-KAY-nee-yuh / eye-KAY-nee-yuhn) and the Klingon would be ’ayqey’nIya’.

I'd probably go with a compromise. You can hear the spoken version, but you'd have to examine the video to see the written version. Memory Alpha and the Okudas' "Star Trek Encyclopedia" go with the written version. The Encyclopedia gives no pronunciation;

Memory Alpha gives the script's pronunciation (and identifies it as such) even though that doesn't match what the actor said (which is not infrequently the case).

So I pick ’ayqey’lIya’ — close to what Worf said and doesn't contradict official stuff.

Not a perfect solution. I'm open to other takes on this!

Note: The final n is there in the English version to make it adjectival. Klingon doesn’t do that — it just uses the noun with no modification.

“Asteroid belt” is ghopDap mIch or ghopDap SIr’o’

As for Ikalia, I think I'll have the rebels call it 'Iqey'lIya' since they're native to the region, and everyone else call it 'ayqey'lIya' due to presumed influence from DIvI' Hol.

Good solution for Ikalia!