system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do so many Asian nationality adjectives end in "ese" (i.e. Chinese, Japanese, Vietnamese, etc.) where so many other nationality adjectives end in "ish" or "an" (i.e. Scottish, American, German, Egyptian, Italian, etc.)? I know there are exceptions, but in general, this seems to be a thing.

Edit: I mean nationality adjectives in English, not their native languages.

edit edit: For instance, Portuguese and Korean are exceptions, and then you have nationalities like "Czech" and "Filipino" which don't end in "ese," "an," or "ish."
gpt
We get our language/nationality names from European explorers who first made contact and had to call them something pronounceable.

Those ending in "ese" were countries first visited by explorers speaking Italian, Portuguese, or a similar language -- this ending is normal in those languages.

Those ending in something else were first visited by explorers speaking other languages.