Björkö (Swedish for "Birch Island") may refer to: Places. Sweden. Björkö, Ekerö, a Lake Mälaren island in Ekerö Municipality, Stockholm County, the location for the World Heritage Site Birka. Björkö, Öckerö, an island in Öckerö Municipality, Västra Götaland County. Björkö, Haninge, an island in Haninge Municipality, Stockholm County. Björkö, the southern part of Väddö island in northern Roslagen, Norrtälje Municipality, Stockholm County. (Also a former parish there.) Björkö, Västervik, an island in Västervik Municipality, Kalmar County. Finland.
https://en.wikipedia.org/wiki/Bj%C3%B6rk%C3%B6