A question about names...

Well, I think it depends on the origins of the kingdoms/cultures. If two kingdoms share a common ethnicity, their names should be consistent. Then there's cultural assimilation to think about. If two different cultures combine in one kingdom, their names should be a mixture of characteristics from both languages.

I have a situation similar to yours in Southerner. Two kingdoms, Yianlai and Kirithia, originated from one tribe. However, the Kirithians intermarried with the Rhornlt, another tribe that migrated to their homeland, and took on many of their cultural characteristics. Kirithian and Yianlai names still follow some of the same conventions, but Kirithian names also follow some Rhornlt conventions.

 

If the question of whether or not the names are rational is important to you, there are a whole lot of things to consider.

Some of the important factors include time, distance and physical/cultural isolation. As there grow the differences grow.

The other big question is environment. Language and culture adapt to environments and habits. Miners will have different slang and names than farmers, who are in turn different than a sea faring culture. Inuit will have a crazy number of words for snow, while Bedoiun may not have any.

Lots of variables to play with and think about.

 

When it comes to names, consistency is an important factor when it comes to immersing the reader into your fantasy world. But consistency does not mean lack of diversity, so long as you explain that this current culture is made up of other cultures resulting in names that have separate linguistic origins. In one way or another, the reader needs to be able to understand that this society/kingdom/whatever has a mish-mush of linguistic influence.

 

Yes. Hubs do that. You should see the varieties of names in places like Vienna for instance...