Recommend "Yin".
The characters in the national title should not be too common, otherwise it will lack a sense of majesty.
The word "Yin" has the meaning of being passed down from generation to generation and endless, and it also has a very good meaning.
However, this country name was used in the novel "Moxiang".
We also recommend "heng", which means justice and balance; "huan", which means majesty and greatness.