I'm from Poland and if you really want a princess combo you should look at the names of some Polish royalty from the past. None of those names are ethnically Polish although they are names used in Poland(a Polish name to me would be one originating from the Polish language).
The names are nice but it's a bit of a mishmash to me. Especially with the French
Bernadette. Polish form is Bernadeta. And in the native language of the saint, Gascon, it is also Bernadeta(it's a nickname her given name in Gascon was
Maria Bernarda with French form
Marie Bernarde).