To provide you with a list of nationalities that have more than one artist represented in a specific database, I would need access to that database or its contents. Since I don't have access to external databases or the ability to retrieve real-time data, I can't generate that list for you.
However, if you have a dataset or a specific list of artists and their nationalities, you can share that information, and I can help you analyze it to find the nationalities with more than one artist. Alternatively, if you're looking for general information about well-known nationalities in the art world, I can provide that as well. Let me know how you'd like to proceed!