I have a solution:
Instead of "borrowing" other civs city names (which I also dislike as a counter-immersive attribute)...
It should be made so that when you do found a city as Atilla, you must type in a city-name of your own choice (e.g. Atilla's Harem, Atilla's House of Horror, Atilla's Space Ship Factory etc.)
Or better still, and something I think people here were wishing for pre-G&K release:
Make it so that Atilla cannot found new cities and that their settlers can instead 'build' barb camps instead of cities (i.e Plop down a barb camp like you normally would a city and watch it spawn barbs that could then be used by you). << now that would add flavour, be unique and fun to play, and be somewhat more immersive!