I wish I could say I was really inventive, but I'm not. I just play SP, so I don't have to worry about having to deceive my opponents with city names!
I use the default names usually and once I hit the generalized names, I try to select new ones to make it easier to keep track of where my cities are on the large or giga-map. For example, if I have a bunch of colonies on an island, I'll give them names of Australian cities as a memory aid. Or Canadian cities for local colour
If I'm playing ToT with the extended game, all cities on Centaurus start with "New". In the Fantasy game, my cities underground, underwater and in the sky are prefaced with under-, aqua-, and over-. Again, just a memory aid.
STYOM
I use the default names usually and once I hit the generalized names, I try to select new ones to make it easier to keep track of where my cities are on the large or giga-map. For example, if I have a bunch of colonies on an island, I'll give them names of Australian cities as a memory aid. Or Canadian cities for local colour

If I'm playing ToT with the extended game, all cities on Centaurus start with "New". In the Fantasy game, my cities underground, underwater and in the sky are prefaced with under-, aqua-, and over-. Again, just a memory aid.
STYOM
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