Well,if you have a national team with 4 players with the same surname it doesn't look the best...just that! I think it would be a thing to consider. Obviously if you think this thing impossible I understand but it doesn't look real.
I don't think there is a shortage of names in BuzzerbeaterEach country has a existing database with probably hundreds of thousands of names.The problem of duplicate names only occurs with random naming bugs. Usually there are very few repeating names in BuzzerbeaterThe most common names like John Smith are going to appear a few times but they have still a very minor chance of repeating.I think adding names to the databases might be an option for a GM power in the future but at the moment I think the BBs have much more important things to be worrying about.