Life / Cool Polish names [133]

I like 'Kinga' for a girl and for a boy I like 'Damian.'
Only I don't understand why Polish people give only Polish names to there children.
A lot of people have the same name, like a lot I hear Piotrek and Ania.
I come from Holland and there people have Dutch, English, French, Scandinavian, Russian,etc... names.