köken: Superficially derived from björn (“bear”) and borg (“(fortified) castle or city”). There are multiple theories about this name, including that it derives from björna (“to dun (a debt)”), (folk-etymologically) from bära (“to bear”) (in uppbära (“to levy (a tax)”); assuming the name developed from Bärnäs to *Björnnäs), from the male given name Björn, or that it is a reference to the coat of arms…
Pori (a municipality, the capital city of the region of Satakunta, Finland)
köken: Shortened from the latter part of Swedish Björneborg. The Finnish name was probably first used in the late 18th century, prior to which the Swedish form was used directly in Finnish without much adaptation.