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How to set dynamic variable for certain region like switzerland that I get common firstname and lastnames like Rudolf Müller for example.
Yes, this seems an interesting ask May be you can raise a feature request to customize the Dynamic variables options in Postman.
Meanwhile as a workaround for your use case,
You can create an array with common first/last names and try to pick the random ones from it. Sorry I am just throwing this suggestion without knowing much about your setup/scenarios. Something like,