I don't speak Russian. They look like cases for Russian declension.
I find 'Почему город Киев называется Киевом?' searching for Киевом.
(="Why is the city of Kyiv called Kyiv?")
In a way it could be useful to have information about cases of geographical names included somewhere. Using flags or even rules?
Yes, they are declension cases.
The problem is that I use alternateNamesV2.zip from premium subscription data in my scripts and there is no way to figure out which one has common case.
for the time being I have marked the nominativ case as 'preferred'. This should solve your immediate issue.
However, we need to either come up with a better solution and flag/mark cases and declension properly or remove them altogether.