[ideaoverload]

Polish example seems to be some mix up of forms:

  Jestem z Polski == I am from Poland
  Jesteś z Polski == You are from Poland
  Jestem Polakiem == I am Polish
  Jesteś Polakiem == You are Polish  

Both have very close meaning but 3&4 seem to be equivalent of examples in other languages given above.

Source: I am Polish