The official "keeper of place names" in Sweden is Lantmäteriet, the Swedish geodetic survey. Unfortunately, the search feature at minkarta.lantmateriet.se seems to be down at the moment. However, OpenStreetMap lists at least five islands or islets named "Bjurön", several neighbourhoods, villages and such named Billsta, two farms named Biby, a village named Bertby in (largely Sweish-speaking) Österbotten in Finland, several villages and farms named Bergsbo, etc. My guess would be that nearly all of those names that are plausible Swedish place names actually exist somewhere.