I think its difficult to give somebody a place name of somewhere in the UK, because its either going to sound pretentious if its somewhere 'posh', or it's just going to sound a bit odd if its somewhere ordinary, like Kingston.
I lived in Kingston upon Thames for many years and parts of it are lovely, but I would be thinking of the one way system and the Bentalls centre.
You could get away with it if it was very obviously alluding to Kingston Jamaica, but I think that would be hard if your child had a British accent.