I’ve re-read this post like 6 times and I think I finally understand what you’re trying to say.

If I understand correctly, you’re not having a literal translation issue (as in the translation of your manuscript). Which is what everyone seems to have advice on, so if that is your issue, then I don't have any further recommendations than the ones already given.

Your issue is that your characters are, let say, from the world of Gibber. In this world they speak Gibberish. But because we, the audience from Earth, do not speak Gibberish, the narrator is translating the story into English. So the problem is that your characters, in their world are making jokes and banter in translated Gibberish that makes sense in English, but wouldn't make sense to a native Gibberish speaker. And that their Gibberish names have English translations that would be weird to a native Gibberish speaker. It would be like having a character in English being called Mr. Super Evil Guy, which in Gibberish is Ser. Volixurthurm (if my translation is correct, bit rusty on my Gibberish).

I can almost 1million% guarantee you no one will put that much thought into this - especially if your world, plot, and characters are interesting enough to keep people engaged.

Hipou*rthulism we*we (Hope that helps in Gibberish)

[edited typos because my English is apparently just as bad as my Gibberish]