Why do some races in Asian end with 'ese' like Chinese and Japanese and some don't?

Answer 1

They are their own species.

I don't know what is meant be that answer as it raises more questions than answers the original. This, hopefully, will explain why and how.

We have a very complicated language in the west and we use 'plurals' and 'collective' terms. The Japanese do not call themselves Japanese but Nihongo wa desu (Japanese am/are is). So it is the west that added the 'ese' to the ends of Asian countries so that we recognise we refer to them collectively. When a country's name however ends with a vowel it would be nonsense to add 'ese' on the end: for instance the collective term for the people of Asia could never be Asiaese so if you note that those ending with 'ese' have the letter 'n' (a consonant) then it is not unreasonable to use an 'n' on the end of Asia to create a collective term for it - Asian. We have a set of grammatic rules that originate from Latin and it is one of the most coplicated languages in the world. Japanese however, is remarkably straight forward and therefore unencumbered. If you were to ask in Japanese where to find something you start with the name of the thing/place you were wanting. It is then very clear to the person you are asking what you want. Our language has a preamble to be polite " I wonder if you wouldn't mind telling me where the lavatory is please"? If you are in a hurry and in Japan you would say "obenjo wa doku des ka"? In Japan you are always considered polite and body language illustrates this to a large extent. Think of how many countries there are and see if you can add an 'n' to it to collectively describe the inhabitants e.g. America (American) Africa and so on. The origins of our language rules are responsible for this too.