Yes, but probably there are people in Iceland and Poland with foreign names. I know that you both wanted to explain that there is a rule in some language and it's nice to find out about that information, but as long as it doesn't apply to everybody, I don't consider this a solution.
In Poland you cannot give children foreign sounding names. So unless we are talking about foreigners visiting,then it does apply to everyone. Like I don't know a single person to whom that rule would not apply.
