At the same time it’s the map’s job to describe the world. Even for something like nation states where there’s an official name, the map uses the common name. Our maps say France, not French Republic.
Changing the displayed name for a body of water shared by several nations doesn’t make much sense, especially when the common name has yet to follow.
At least that’s from the perspective of one of the goals the map ostensibly wants to serve.
We also check to see if the word that popped into our heads actually rhymes by saying it out loud. Actual validation steps we can take is a bigger difference than being a little more robust.
We also have non-list based methods like breaking the word down into smaller chunks to try to build up hopefully more novel rhymes. I imagine professionals have even more tools, given the complexity of more modern rhyme schemes.